SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following BEST explains why Earth is tectonically active?
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Earth’s solid surface layer rotates more rapidly than the layers beneath it.
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Areas of Earth’s solid surface layer are under great pressure from ocean water.
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Earth’s solid surface layer sits on a layer of semimolten rock that slowly flows.
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Areas of Earth’s solid surface layer are thicker and so heavier than other areas.
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Explanation:
Detailed explanation-1: -Tectonic activity is caused by heat loss; all the terrestrial planets passed through a molten (or nearly molten) stage early in their development and they have been cooling ever since. As they have cooled, they have formed a strong outer layer-the lithosphere.
Detailed explanation-2: -Which of the following changes would end Earth’s tectonic activity? Earth’s mantle becomes cooler and solid.
Detailed explanation-3: -This is the outside layer of the earth and is made of solid rock, mostly basalt and granite. There are two types of crust; oceanic and continental. Oceanic crust is denser and thinner and mainly composed of basalt. Continental crust is less dense, thicker, and mainly composed of granite.
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