How did the core and mantle form?
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Answer: Earth's metallic core separated from the mantle by planetary differentiation in a global magma ocean. Very dense metallic compounds separated from lower-density silicate compounds to produce a metallic core and a silicate mineral mantle. As Earth cooled, crystallization and inward settling of iron metal caused distinction of a solid inner core and a remaining molten outer core. The mantle solidified into silicate minerals with a chemical composition similar to peridotite. Very high temperatures within early Earth resulted from collisions with accreting embryos and higher hear production by radioactive decay.
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The hypothesis known as the demographic transition states as countries become industrialized and economically developed, their ____.
A. populations grow exponentially B. populations grow linearly C. populations grow more slowly D. per capita income falls E. poverty rates increase
An organism's range of tolerance is most closely related to an organism's ________
A) rainfall minimum B) habitat C) toxic chemical threshold D) ecological niche E) temperature maximum
Approximately how many new organic compounds are reported each year?
A) 1000 B) 10,000 C) 100,000 D) 1,000,000
Evaluate the costs and benefits (more than economic) of using coal, oil, and natural gas. In your evaluation, provide the pros and cons and the context in which each energy source would work best.
What will be an ideal response?