What role does fluid play in metamorphism?
What will be an ideal response?
Answer: Fluids, present in the original rock or introduced from magma or high-temperature dehydration and degassing reactions, create metamorphic minerals that incorporate components from the fluid molecules. Metamorphic reactions take place faster and at lower temperature in the presence of water than they do under dry conditions. The movement of fluid during metamorphism delivers some ions and removes others, so that the metamorphic rock has a different bulk composition than that of the parent rock.
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Studies have shown that children whose parents smoke cigarettes are more likely to develop asthma from breathing _________ smoke.
Fill in the blank(s) with the appropriate word(s).
Moving toward the poles, climate becomes
A) warmer. B) colder. C) wetter. D) more tropical.
Each trophic level in a food chain or food web contains a certain amount of organic matter, called ____.
A. food B. energy C. biomass D. organisms E. decomposition
Although most of the world's forest are shrinking, biologist are especially concerned about tropical forest loss because?