Uranium-238 (U-238) decays into lead-206 (Pb-206). Which of the following is a true statement?
A.Pb-206 is the parent, and U-238 is the daughter.
B.U-238 is the parent, and Pb-206 is the daughter.
C.A rock sample containing a relatively large amount of U-238 is old.
D.A rock sample containing a relatively small amount of Pb-206 is old.

The correct answer is True. Rural areas are indeed defined as any areas that are not considered urban.

Urban areas typically have a high population density and large built-up areas, whereas rural areas have lower population densities and are often characterized by open spaces, agricultural landscapes, and small towns or villages.

The definition of what constitutes an urban or rural area can vary by country and the criteria used by statistical agencies, but the general distinction holds that rural areas are those outside of the urban context.

The gene expression of the organism may be affected by the environment. This includes the outside ecosphere where the entire creature and organism are situated or progresses, and also as the organism's interior ecosphere, these consist of the aspects of metabolism and hormones. Even though the structure of genes is unaffected by the environment, the gene expression (how the genes work) will be affected. Factors in the environment like drugs, foods, and toxins may result in some epigenetic changes by changing how the DNA bind by the molecules and the structure change of the proteins that the DNA wraps. 

Answer:

enviromental conditions can affect gene expression and influence traits

Explanation:

Study island :)

The geographic grid line 180 degrees of longitude from the prime meridian is the International Date Line.

The point within Earth from which earthquake wave energy radiates is known as the a. 'hypocenter.'

The hypocenter, or focus, is the exact location beneath the Earth's surface where an earthquake begins. This is the point at which the crust or mantle first ruptures, releasing seismic energy that spreads out in all directions. The hypocenter is always located at some depth within the Earth.

The epicenter is directly related to the hypocenter. It is the point on the Earth's surface that lies vertically above the hypocenter. While the earthquake originates at the hypocenter, the epicenter is often the location where the effects of the earthquake are most strongly felt because it is closest to the source of the seismic energy.

Earthquakes often occur due to the movement along faults in the Earth's crust. According to the elastic rebound theory, stress builds up in rocks on either side of a fault until they eventually snap and release energy, causing an earthquake. This rupture starts at the hypocenter.

Seismology is the study of earthquakes and seismic waves. Seismologists use instruments called seismographs to measure the waves and determine the location of both the hypocenter and epicenter.

Complete Question:

The point within Earth from which earthquake wave energy radiates is known by which of the following terms?

Hypocenter

Epicenter

Elastic Rebound

Fault

Seismology

Cyrus McCormick patented the _____ in the 1800s.

 mechanical reaper

The correct answer is - A rigid rules and schedules ignored local growing conditions.

The great Chinese famine is still discussed nowadays, and what were the actual causes for it. It seems that the strict and not very well thought through policies of the government in that period was the main cause because the planing was terrible, measures for protection of the crops were on a minimum, the amounts of certain product were projected for perfect conditions so any little disturbance would immediately cause a problem with starvation. The government blamed it all on the weather conditions, but it was just cover their terrible policies in the agricultural department. The starvation was so terrible that around 30 million people died and 30 million births were postponed.

I believe the answer is D.)  Factor 1 is a human induced factor and Factor 2 may be influenced by both nature and human factors.

HOWEVER: I'm not 100% sure. I'm taking the test at this moment. Just keep in mind, this might not be correct. But, is an educated guess.

Answer:

A

Explanation:

It is the second smallest continent in the world.

Ice wedging is not a form of chemical weathering. It is a process of physical weathering wherein water seeps into rock cracks, freezes, expands, resulting in further cracking. This is a physical, not chemical process.

The statement, 'Ice wedging is a form of chemical weathering,' is False. Ice wedging is actually a form of physical weathering. It takes place when water seeps into the cracks of rocks, freezes and expands.

When the ice melts, it creates larger cracks. These processes repeat over time, resulting in the breaking down of rock substances.

This process does not involve any chemical reactions, thus it falls under physical, not chemical weathering.

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Marine magnetic anomalies can be used to estimate the rate of sea floor spreading.

Marine magnetic anomalies were first discovered in 1950 and they are described as the changes in earth's magnetic field due to the change of chemical composition of rocks. At mid-ocean ridges, the magnetic variation parallel to mid-ocean ridges supports seafloor spreading.  

The theory of seafloor spreading is proved by the presence of minerals present in gabbro and basalt rocks which depict magnetism properties resulting from the formation of ocean crust at ocean ridges. The rocks acquire magnetization after magma has risen and cooled. As the seafloor spread, the rocks are carried away from the ridges.

Answer:

1 billion is gonna be your answer

Explanation:

This tells us that that star is one of the brightest in the sky.

The apparent visual magnitude of a star is 7.3. This tells us that the star is not apparent to the human eye.

Star is referring to luminous objects or celestial body which shines with their own light, unlike other satellites or planets which take light from Sun to shine In the galaxy.

As a result of our atmosphere's light-scattering characteristics, which distribute sunlight throughout the sky during the day, stars are not visible during those times. As our Sun's photon cloud thickens, it gets harder to see a distant star's weak light.

Even while the stars appear to be stationary, they are actually constantly moving and have been imaginatively associated with figures by ancient sky observers. Simply said, they are too far away for the human eye to see them move.

Learn more about Stars, here:

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Answer:

C. Scale

Explanation:

Scientists studying the effect of climate change can make use of wildfires as a simple case study.

Climate change is a global phenomenon because climate have predictable global patterns. Climate is highly affected by the global circulation and movement of air masses from one place to another.

If an activity in America such as burning fossil fuels is on the rise, the effect would not only be localized to that part of the world alone, agents of climates will randomly disperse the burden through a world wide global circulation pattern. This can be felt on a small scale by increasing wildfires in Australia.

Answer:

scale :)

Explanation:

Due to its massive size, climbing Mount Elbrus is a long task. However, if climbing by the standard route, it is one of the easiest of the peaks on the continent to climb. Many climbers and skiers still die every year as they take unconventional routes. The mountain is a part of the Caucasus Mountain range, and it has the highest peak in the mountain range.

Answer:

Culebra cut !

Explanation:

The downslope sliding of the lithosphere away from a spreading centre is called a ridge push.

Ridge push otherwise sliding plate or gravitational sliding force is a force that causes plate tectonics motion at the mid-ocean ridge. Sliding is caused by raised asthenosphere that eventually pushes the lithosphere into the subduction below mid-ocean ridges.  

The force, however, acts on the entire ocean plate and not only on the ridges due to gravitational force. It is called ridge push because earlier models of plate tectonics during simulations showed the upwelling of the magma during spreading of the sea-floor at mid-oceans ridges which cause the plate to diverge.  

Answer:

TRUE

Explanation:

    New York is one of the most famous cities in the world, the most visited by tourists (13.67 million visitors in 2018) and with the largest number of tourist attractions, as well as being an excellent option for shopping in the United States.

    New York is the most populous city in the United States and the third most in America, behind Sao Paulo and Mexico City. In its streets we can hear over 800 different languages.