Cold periods lasting from hundreds to milions of years when glaciers cover as much as earth are called

A Syncline is where lays of rock bend downwards and then curve up.

An Anticline is the opposite: layers of rock bend upwards and then down.

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Accretion of material due to supermassive black holes in galactic cores leads to intense active galaxies luminosity.

The center of the galaxies has a high luminosity as compared to other parts postulated to be emitted by something other than the stars because of its intense luminosity. They are electromagnetic radiation source which is useful for discovering objects from outer space.  

They can be observed by gamma rays, ultra-violet, radio, microwave, x-rays, infrared, and many more similar. Classification of an active galactic nucleus which is based on their observed characteristics has been made and the quasar is the powerful one.  

A star can be classified according to the following: main sequence, giants, and supergiants. On the other hand, the spectral class of a star is classified according to their temperature, absolute magnitude and solar luminosity. 

Based on an existing classification, a star with an identified spectral class of M2 and a magnitude of +15 would be classified as a main sequence star.

The United States involved in the Vietnam War to prevent the takeover of South Vietnam by communist North Vietnam.

Answer: Option (c)

Explanation:

The U.S troops entered into the "Vietnam War" to prevent the communist activities and to help french in the war. Domino Theory was one of the reasons for the involvement of the U.S in the "Vietnam war".

This theory states that communism would spread if Vietnam became a communist. Nearly 16000 Americans were sent to Vietnam for supporting South Vietnam troops.

Answer:

The name of the long valley that extends along the 'eastern side of Africa' and has several long slender lakes on its floor is the 'Great Rift Valley'.

Explanation:

Answer:

the creation of Israel

Explanation:

The two hemispheres of Mars are vividly unlike from each other—a unique not seen on any other planet in our solar system. The answer is the largest difference is that the southern appears older and with more impact craters. 

ANSWER:

The largest difference between the northern and southern hemisphere of Mars is the elevation.

EXPLANATION:

The answer is BEIJING, but:

Technically, there are two capitals of China.

The People’s Republic of China has 北京 / Beijing / Peking as its capital.

The Republic of China has 南京 / Nanjing / Nanking as its capital although since 1949, Taipei has served as its temporary capital.

Both 北京 / Beijing / Peking and 南京 / Nanjing / Nanking are located in Mainland China and both cities served as capital for Imperial China during the Ming Dynasty (1368–1644), Nanjing from 1368 to 1644 under the name of Yingtian; Beijing (then known as Beiping) as co-capital from 1403 and onwards under the name of Shuntian.

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Currently, most of the mass of the matter of the universe is believed to consist of dark matter not made of protons and neutrons. Thus option D is correct.

The matter and power found in space are included in the universe. It contains the air, gases, and planets that are present in the environment and creates the conditions for life to exist.

Clouds, our solar system, and life on Earth are believed to have developed through a variety of processes that were part of God's creation of the universe which consists of various elements present in the surroundings.

As protons, neutrons, and electrons, commonly known as ordinary matter, constitute most of the universe's mass, dark matter is a speculative kind of material that is thought to make up around 85% of the universe's mass.

Therefore, option D is appropriate.

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The complete question is Probably

Currently, most of the mass of the matter of the universe is believed to consist of:

Select one:

A. tachyonic matter, travelling only faster than the speed of light.

B. tiny but very numerous black holes.

C. baryonic matter, made up of protons and neutrons.

D. dark matter not made of protons and neutrons.

E. dark energy.

The type of lava most likely to erupt from a convergent plate boundary involves more explosive eruptions with andesitic or rhyolitic lava. In contrast, a hotspot like that under Hawaii produces mafic basaltic lava, while one under continental lithosphere like Yellowstone can produce felsic rhyolitic magma.

The type of lava most likely to erupt at plate tectonic setting 'b' would depend on the specific type of boundary that 'b' represents. However, since the question does not specify what 'b' stands for, we can use the context provided to infer that setting 'b' refers to a convergent plate boundary, which is associated with explosive volcanic activity and the production of andesitic or rhyolitic lava, due to the melting and interaction of oceanic and continental lithosphere. On the other hand, a hotspot, such as the one under Hawaii or Yellowstone, can produce both mafic (basaltic) and felsic (rhyolitic) lavas depending on whether it is beneath oceanic or continental lithosphere respectively. For instance, hotspot volcanism at Hawaii is due to a mantle plume that produces mafic basaltic lavas, which can form shield volcanoes with effusive eruptions and create pahoehoe lava flows. Contrastingly, the Yellowstone hotspot, under continental lithosphere, has resulted in explosive eruptions and the production of felsic magma, resulting in the formation of rhyolite and the ash flow tuff of the Lava Creek Tuff.

France invaded Madagascar in the late 1800s. In Southern Africa, HIV/AIDS and malnutrition are common causes of death among children, Ghana's wealth came from gold, and West Africa's economic challenges include an uneducated workforce and limited infrastructure.

France invaded and took control of Madagascar in the late 1800s as part of its colonial expansion in Africa.

Common causes of death among Southern African infants and children include HIV/AIDS and malnutrition. Smallpox has been eradicated worldwide, and Ebola outbreaks, while serious, are less common.

The basis of Ghana's wealth was primarily gold. Oil has become important more recently, but in historical terms, gold was central to Ghana's prosperity.

West Africa's traditions have been kept alive through various art forms including carved masks, griots (storytellers), and kente cloth.

Economic problems in West Africa are often caused by factors such as an uneducated workforce and limited infrastructure. The depleted diamond mines and too much diversity of industries are not commonly cited as major causes of current economic issues.

The main cause of conflict in many West African nations is poverty and land ownership rights, with ethnic diversity also playing a role in some conflicts.

Ghana is one of the West African countries with a hardwood industry.

Human activities causing desertification in the Sahel include grazing large herds and overfarming. Drilling for oil and mining can also impact the environment but are not as directly linked to desertification as the other two activities.

Kinshasa is known worldwide for its music, particularly for being a center of African rumba and soukous music.

Since they do not combine among the electromagnetic force, they do not sense resistance or pull and hence do not engage with the bottom of the protogalactic cloud.

WIMPs (Weakly-Interacting Massive Particles) are theoretically established to obscure material. It is in their quality to be limited interactive, so they are dispersed everywhere galactic radiance and unconcentrated within specific galaxy's plate.

The statement is true; life expectancies for Asian Americans and Hispanics are generally higher than those of Native Americans and African Americans in the U.S., due to various health disparities and socioeconomic factors.

The statement that life expectancies for Asian Americans and Hispanics are higher than the life expectancies of Native Americans and African Americans is generally true. Data clearly indicate that racial and ethnic disparities in health outcomes exist in the United States. For instance, Whites born in 2007 were expected to live, on average, 78.4 years, whereas African Americans were expected to live only 73.6 years. This gap is even more pronounced for African American males, who have a life expectancy of only 70.0 years. The infant mortality rate for African Americans is also significantly higher than that for Whites, and this, along with other health disparities, contributes to the overall lower life expectancies for African Americans when compared to Whites, Asian Americans, and Hispanics.

Furthermore, socioeconomic factors play a crucial role in these outcomes, as race and ethnicity often intersect with social class to influence life expectancy. While there may be variations within these groups, such as among Latinos where Cuban Americans have fared better than others and among Asians where people with Chinese and Japanese backgrounds have better outcomes, the general trend indicates that Asian Americans and Hispanics tend to have higher life expectancies than Native Americans and African Americans in the U.S.

Answer:

Mercator

Explanation:

The Mercator projection is a cylindrical map projection presented by the Flemish geographer and cartographer Gerardus Mercator in 1569. It became the standard map projection for navigation because of its unique property of representing any course of constant bearing as a straight segment.

The United States and Western Europe used the UN, NATO, and the Marshall Plan for post-World War II cooperation, but NAFTA was not used in that era.

After World War II, the United States and Western Europe employed various mechanisms to bolster political and economic cooperation. They utilized:

A. The United Nations (UN) to promote international collaboration, peace, and security.

B. NATO (North Atlantic Treaty Organization) for mutual defense and military cooperation.

D. The Marshall Plan, which was an American initiative providing substantial financial aid to assist in the reconstruction of Western European economies, enhancing economic collaboration and recovery.

However, option C, NAFTA (North American Free Trade Agreement), was not part of these post-war efforts. NAFTA was a trade agreement between the United States, Canada, and Mexico, and it came into effect in 1994, several decades after the conclusion of World War II.

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Decomposers are vital for the nitrogen cycle due to their role in breaking down organic material, which releases nitrogen into the soil, initiating the process of ammonification. So, option B is correct.

The nitrogen cycle is an essential biogeochemical process that recycles nitrogen through various forms in the environment. When answering the question of which component is necessary for the nitrogen cycle, one must consider the processes that directly involve the transformation of nitrogen. Among the options provided, decomposers play a crucial role in the nitrogen cycle. They help break down dead organisms and waste products, which in turn releases nitrogen in the form of ammonium into the soil through a process known as ammonification. This ammonium can then be further processed by other microorganisms in the cycle, such as through nitrification and denitrification. Therefore, the correct choice among the options provided is B) decomposers.

The correct answer is B) decomposers  is needed for the nitrogen cycle.

The asnwer is A,  Anglo-Chinese War.