Why did scientists not know the 1989 San Francisco earthquake was coming?

Answers

Answer 1
It's the simplest reason really, because the earthquakes can not be predicted. Talking about a short term prediction, yes, some occurrences give heads up that an earthquake is coming, though it is never a sure thing, but speaking long term, no earthquake can be predicted. Scientists know which are the places where earthquakes will most likely appear, but very often they are up to a surprise.

Related Questions

The net primary productivity of cultivated land is most similar to the net primary productivity of which ecosystem?

Answers

The net primary productivity of cultivated land is most similar to the net primary productivity of the temperate grassland. Temperate grassland is a terrestrial ecosystem whose main plants consist of shrubs or grass. The environment is temperate and it ranges from semi-humid to semi-arid.

The net primary productivity of cultivated land is probably most similar to that of tall-grass prairies or temperate deciduous forests, which have significant natural productivity, unlike the extremes of tropical rainforests or deserts.

The net primary productivity (NPP) of cultivated land can be compared to various natural ecosystems based on their energy accumulation and conversion efficiency. As the table provided does not specify the exact NPP of cultivated land, we must infer based on general knowledge about ecosystems. Typically, cultivated lands have moderate to high NPP due to human management, including the use of fertilizers, irrigation, and crop breeding, to optimize production. Therefore, the NPP of cultivated land might be most similar to ecosystems like tall-grass prairies or temperate deciduous forests, which have substantial natural productivity and are often associated with fertile soils and favorable water availability. Cultivated land's productivity generally would not match that of a tropical rainforest, which has the highest NPP, nor would it be as low as a desert ecosystem.

Rainforests may be located in what latitude range?


A) 10° S to 25° N
B) 30° - 50° N and S
C) 35° - 55° N
D) 60° - 75° N

Answers

Actually its 10° S to 25° N

What do we mean when we say that the rotation curve for a spiral galaxy is "flat"? what do we mean when we say that the rotation curve for a spiral galaxy is "flat"? the disk of a spiral galaxy is quite flat rather than spherical like the halo. gas clouds orbiting far from the galactic center have approximately the same orbital speed as gas clouds located further inward. the amount of light emitted by stars at different distances is about the same throughout the galaxy. all the galaxy's mass is concentrated in its flat, gaseous disk?

Answers

it does not get disturbed by anything just and eliptical pattern

When a galaxy is observed moving toward the earth, what visible radiation (as in, which color) will it emit?

Answers

It will emit Red because it is moving towards (which creates heat) instead of away (which is blue and cooler).

I hope this helps!

Answer:

When a galaxy moves towards the earth, it will emit blue colour light.

Doppler blueshift occurs when the source of light is coming near to its observer. Alternatively, Doppler redshift occurs when the emitter of light moves away from its observer.

Blueshift occurs when wavelength of light decreases. Redshift occurs when wavelength of light increases.

Blueshift makes the colour of the light move from red towards blue.

The shift in wavelength is determined by observing the spectrum with a spectrometer.

What change came to Northern Ireland in the late 1990’s?

Answers

Answer:

Belfast Agreement ()Good Friday Agreement)

Explanation:

Northern Ireland has been a troubled region. There were lot of clashes and conflicts, based on religion, ethnicity, politics, and that was also used by the terrorist organization IRA which was very active and killed and injured lot of people. In 1998 though, this finally came to an end, and the political parties from Northern Ireland and Britain as to how Northern Ireland should be governed and to eliminate the tensions. This agreement is known as the Belfast Agreement, also referred to as the Good Friday Agreement. This agreement also resulted in decline and eventual dismembering of IRA as well.

Answer:

the signing of a peace agreement (gradpoint)

Explanation:

How does convection transfer heat from one place to another on the earth?

through the movement of winds and currents

through the movement of precipitation

through the angle of the sun’s rays

through the greenhouse effect

Answers

Thermal energy is transferred from hot places to cold places by convection. Convection occurs when warmer areas of a liquid or gas rise to cooler areas in the liquid or gas. Cooler liquid or gas then takes the place of the warmer areas which have risen higher. This results in a continous circulation pattern. Water boiling in a pan is a good example of these convection currents. Another good example of convection is in the atmosphere. The earth's surface is warmed by the sun, the warm air rises and cool air moves in.

Convection is the movement of heat through gases or liquids. Heat from the sun heats the air which can account for A and D, but a lot of the Earth's heat is distributed by the ocean. Water has a high specific heat which can absorb a lot of heat in one place, and distribute it in a colder place evening out the Earth's temperatures a bit.

So, the answer would be 
through the greenhouse effect
And could also be through the movement of winds and currents

What do most current climate models suggest will happen to global temperatures by the end of the 21st century?

Answers

Current climate models base their operations on how much CO2 will be emitted in the future. Considering the actual trend, most models shows a rise in temperature in between 4/6 centigrade. Considerable change are possible with significace changes in the emission of co2.

ANSWER:

Most current climate models suggest that the global temperatures will rise by the end of 21st century.

EXPLANATION:

This will happen because of the global warming being caused by the greenhouse gas emissions. The rising temperatures will change the rate of precipitation which will increase because with more evaporation, the water cycle will become faster. The increased temperatures will also cause ice and snow to melt more resulting in the decrease in the glaciers and ice sheets that float on oceans. The climate will change in an extreme manner meaning that summers and winters will become more severe.

issues such as lack of land and lost resources are examples of this


the term used to describe the growth of industries


a cause of increased air and water pollution in Southeast Asia


the term used to describe a situation in which a few people are wealthy while most live in poverty


the desire for an urban job as well as access to education and government services is an example of this

industrialization

pull factor

push factor

urbam crowding

icome gab




Answers

1.push factor
2.industrialization
3.utban crowding
4.income gap
5.pull factors
The answers are:
push factor
industrialization
utban crowding
income gap
pull factors

What is the heaviest element that can be fused in the core of a star?

Answers

It all begins with hydrogen fusion to helium and helium fusion to heavier elements like carbon and oxygen. However, the heaviest element that can be fused in the core of a star is known as iron and sometimes nickel, too.

I hope I was able to help you! :)

Answer:

The heaviest element which can be fused in the 'core of a star is iron'.

Explanation:

Throughout a stars lifetime, there is a 'continuous fusion reaction' going on in its core. This reaction is fed by various elements present near the core of the star.These elements can most probably be hydrogen, helium, carbon, oxygen, nickel, and iron. When the star runs out of one elements, it uses the other to continue the fusion reaction going on in its core.

In the 1800s, the work of raising tobacco, rice, or cotton on plantations in the South was done by _____. 1. enslaved people from Africa and the West Indies 2. English, Scottish, and Irish immigrants 3.Mexican and Cuban immigrants 4. enslaved people from the Natchez, Creek, and Cherokee tribes

Answers

In the 1800s, the work of raising tobacco, rice, or cotton on plantations in the South was done by _____.

 

enslaved people from Africa and the West Indies

Pick your poison i'd say both or "enslaved people from Africa and the West Indies " because we all know history right?

enslaved people from the Natchez, Creek, and Cherokee tribes

Which statement about the Mau Mau Rebellion is not true?

The rebellion began when Kikuyu took land from the Masai.

The rebellion’s leader eventually came to power.

The rebellion was crushed by the British.

The rebellion was fought in the 1950s.

Answers

The Correct Answer Is a.) The rebellion began when kikuyu took land from Masai.
Answer:

A) The rebellion began when Kikuyu took land from the Masai.

Explanation:

The Mau Mau rebellion is a result of battles fought during the colonial times in Kenya revolting against the colonist settlers. The country was faced with a lot of challenges politically, economically, etc. However, the colonial settlers worsened the situation by enforcing laws that in their favor for land ownership capturing land from the natives.  

The revolution began with various attacks against the European settlers that led to damaging their property and they further gained support from Kenyan natives across the country through their uprising movement to gain back the land and eradicate the European settlers.

How would a archeologist found out how a civilization collapsed?

Answers

I think that they should find like old artworks like statues or documents and do some research on when that stuff was made and determine if that civilizations that the statue or whatever was originated and do research on that civilization and how it fell.

Hope this helped :)
Have a great day

Which region of the early universe was most likely to become a galaxy? which region of the early universe was most likely to become a galaxy? a region whose matter density was lower than average a region whose matter density was higher than average a region with an unusual concentration of dark energy?

Answers

The answer is : a region with an unusual concentration of dark energy. A region whose dark matter density was higher than average, because gravitational runaway takes regions that are initially denser and makes them the more denser.

Answer:

The region of the 'early universe' whose matter density was higher than the average was most likely to become a 'galaxy'.

Explanation:

For an object to be subjected to gravity, it needs to have a specifically higher density. During the formation of galaxies in the early universe, 'the action of gravity' within and over the dense regions of the universe is believed to have 'played a significant role'. The regions which are found in the universe denser than average were the regions where the 'first galaxies of the universe' were formed.

HELP!!!!!! FAST!!!! What role does the S-P interval play in locating an earthquake epicenter?

Answers

P and S waves travel at known velocities through the Earth. S waves are slower than P waves by a known amount. As the P and S waves travel out from an earthquake the P waves get progressively farther ahead of the S waves. Therefore, the farther a seismic recording station is from the earthquake epicenter the greater will be the difference in time of arrival between the P and S wave. The distance of a seismic station from an earthquake is easily determined from the S-P interval, the time difference between the time of arrival of the first P wave and the first S wave.

Hypothetically, scientists could lower Earth's temperature by ________, in order to combat global warming.

Answers


By reflecting more light from land masses 

What sequence of events led to the origin of the Himalayas in Asia??

Answers

The Himalayan mountain range in Asia formed as a result of the collision of the Indian tectonic plate and the Eurasian tectonic plate. The Indian tectonic plate was once a big island, but it started moving towards Asia, when it finally reached it they collided. Both of the plates have the same density, that resulted in none of them to be submerged, but instead to press against each other and thus start lifting the land. Over time the Himalayan mountain range formed, and till this day this process continues and it is still lifting up.

Compared with the rest of Brazil, the northeast region has _____.


a lower standard of living


a wetter, cooler climate


a higher population density


an economy more dependent on industry

Answers

The answer is actually A). A lower standard of living Hope this helps :)

Which part of a hurricane consists of dry, descending air?

Answers

The eye consists of dry, descending air.

How has population growth affected North Africa and Southwest Asia? Choose all that apply.


decreased biodiversity
decreased forested areas
decreased salinity
increased food security
increased urbanization

Answers

decreased biodiversity
decreased forested areas
increased urbanization

I hope this helps :) 

SOS;

The answers are:

decreased biodiversitydecreased forested areasincreased urbanization

Hope this helps!!

Strategies to improve water quality in the region include _____.
building dams
improving irrigation techniques
urbanization
building storage facilities
salinization


What is political Islam?

the ceremony that celebrates political freedom
the government's management of economic and environmental resources
the incorporation of Islam into government functions
the religion of the Israelis



Why was North Africa important to its conquering states?

as a source of food and trade
for its precious metals
for strategic military purposes
no importance whatsoever


The two main reasons for conflict in Southwest Asia today are natural resources and .

Which of the following civilizations had their beginning in the area known as the "Cradle of Civilization," or Mesopotamia?


Assyria
Babylonia
Egypt
Han
Indus
Sumer

Answers

1. Strategies to improve water quality in the region include: Building Dams, improving irrigation techniques, building storage facilities.  This is because in order to save water we need to build these types of facilities and improving irrigation techniques.

2. What is Political Islam: The incorporation of Islam in government functions.  Their government is very different from the U.S political government where they help improve the U.S's economy unlike in Islam where their economy isn't all that great due to the war they've been having and the U.S is doing what they can to help them.

3. Why was North Africa important to its conquering states: As a source of food and trade. Unlike America, Africa doesn't have a government system to where it gives the people money to buy food, homes, clothing, etc. The Africans have been trading their stuff for food, clothing, etc. 

4. The two main resources for conflict in Southwest Asia today are natural resources and: Religion. They have a lot of religion because they believe in different Gods.

5.  Which of the following civilizations had their beginning in the area known as the "Cradle of Civilization," or Mesopotamia: Assyria, Babylonia, and Sumer.  The Cradle of Civilization was the start of all of the civilizations like the Mayan Civilizations.

Hope this helped :)
Have a great day   

Final answer:

To improve water quality, regions can improve irrigation techniques and build storage facilities. Control of water resources in ancient Mesopotamia was crucial to the success of civilizations like Assyria, Babylonia, and Sumer.

Explanation:

Strategies to improve water quality in the region include improving irrigation techniques and building storage facilities. Political Islam refers to the incorporation of Islam into government functions. North Africa was important to its conquering states for strategic military purposes as well as being a source of food and trade. The two main reasons for conflict in Southwest Asia today are natural resources and political disputes. The civilizations that had their beginnings in the area known as the "Cradle of Civilization," or Mesopotamia, include Assyria, Babylonia, and Sumer.

________ occurs when rocks bend, break, or flow during mountain building

Answers

The answer is - orogen forms.
Orogeny is the event that leads to a large structural deformation of the Earth's lithosphere, where the crust is affected and also the upper most part of the mantle layer, and this is as a result of the interaction of the plate tectonics. An orogenic belt develops when a continental plate crumples and is pushed upwards to form one or more mountain ranges.

The _______________ is the warming of earth due to the atmospheric accumulation of carbon dioxide and certain other gases, which absorb reflected infrared radiation and re-radiate some of it back toward earth.

Answers

the greenhouse effect

How does trade and exchange affect groups of people? How does this relate to wealth in Brazil?

Answers

Trade and exchange mostly always benefits those nations that engage to it, nevertheless only when it is average to the total national economy. Also, a minority is always hurt by the evolution of trade patterns, and they’ll always ask for protection. In relation with this, Brazil is composed of a only a few wealthy people and a lot of very poor people. This gap among the highest and lowest socials levels is so huge, even though it already decreased during the late 1990s. However, stabilization to the economy, by means of lower inflation levels has likely added more purchasing power to the less fortunate.

MATCH

1. movement of people between places on a regular basis
2. the study of population
3. average number of children a woman will have in her lifetime
4. the number of people who live in a square mile or kilometer
5. people who leave their homelands seeking safety in a foreign country

a. population density
b. fertility rate
c. refugees
d. cyclical migration
e. demographics

Answers

1 is letter d 
2e
3b
4a
5c

Answer:

1d  

2e

3b

4a

5c

Which two aspects of climate change appear to be having the most impact on forests?

Answers

The two biggest aspects of the global climate change that impact the forests are the temperature and the precipitation. The temperature increases globally, this affects the forests because the trees are adapted on certain temperatures, but now are faced with rapid increase of the same, and the time for adaptation is much shortened, so lots of forests degrade or gradually die off. The precipitation is a crucial factor for all plants. The forests are on places where there's sufficient amount of precipitation, but now lots of regions in the world are suffering from reduced precipitation, this also causes the degrading and dying off of the forests.

which is a wave-cut platform?
A)a sand ridge
B)a flat bench like surface
C)a ridge of sand projecting the bay
D)a sandbar

Answers

you answer is d $$$$$$ sorry they said it was to short 



ANSWER:

A wave cut platform is a 'flat bench like surface'.

EXPLANATION:

This a narrow flat area that is found along a shoreline. The area is created because of erosion caused by water that hits the shoreline.A 'wave cut platform' can be easily seen when the tide is low. 'Wave cut platforms' are usually huge areas of 'flat rocks'. These are mostly formed because of the cliff erosion and the rocks are more resistant that undergo weathering but are rarely carried away by water.

The region of the world with the earliest evidence for the transition to food production occurs in

Answers

The region when people started settling and started to produce food (from the evidence we have so far) is the Middle East/Western Asia, known as 'Fertile crescent'.
It is here where people first started producing food for their own needs, instead of strictly depending on hunting and gathering. They started with farming crops around the bigger rivers with fertile alluvial soil. This allowed them to avoid starvation, to have more stable food source, but also influenced on the development of the settlements, and in time art, science, technology...

What are some religious holy places for Jews , Christians, and Muslims in this subregion?

Answers

Jewish holy places:
- Temple Mount; the place where God chose the Divine Presence to rest.
- Jerusalem; spiritual center.
Christian holy places:
- Jerusalem; Jesus was teaching here, his entombment was here, he was crucified on a nearby hill...
- Nazareth; hometown of Jesus.
- Bethlehem; birthplace of Jesus.
- Cana; Jesus made his first miracle here.
Muslim holy places:
- Masjid al-Haram (Mecca)
- Al-Masjid al-Nabawi (Medina)
- Al-Aqsa Mosque (Jerusalem)

The centennial high school parking lot is five blocks down from the softball field these directions are an example of describing a place by giving its ___ location

Answers

By saying the centennial high school parking lot is five blocks down from the softball field is using a relative location using people's knowledge of a familiar landmark like the softball field as a reference to visualize where the parking lot is in space. 

How is cotton farming harmful to the soil what was done to keep the earth usable?

Answers

The cotton farming is harmful to the soil because it is very easily infested by worms, and to keep the crops safe and healthy a big amount of pesticides are used. The big amount of pesticides are washed away with the water into the soil, the soil gets contaminated, and also the underground waters, and a big damage is done to the surrounding environment as well. Since it requires a lot of water for irrigation, also salinisation of the soil occurs, thus the soil is degrading. For this process to stop, in recent times the cotton farming has been directed in the way of the organic production, where there's no usage of toxic chemicals, but organic ones.
Answer:

Cotton plants require large quantities of nutrients and they absorb all the nutrients from the soil, what has been done to have the soil beneficial is cotton farmers ought started crop alternating.

Explanation:

Indeed if cotton farmers follow crop rotation because the pesticides and fertilizers do not endure on the plants themselves, they can influence later cotton crops, other food yields an area that may not relate to the cotton farmer at complete.

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