Isostasy is
A. the buoyant force exerted on the mantle by continental crust.
B. the positioning of the crust in response to the buoyant force and gravity.
C. the buoyant force exerted on the mantle by oceanic crust.
D. the force of gravity acting on the crust.
Answer: B
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A. invasive B. native C. indicator D. specialist
Petroleum and oil reserves are often found in sedimentary rocks because
A. these rocks can contain fossilized organic matter. B. these rocks are very porous and permeable. C. chemical changes occur to create these reserves. D. oil accumulates in the sediments.
Analysts vary as to their opinion of which factor is the more serious threat to the Earth's life support systems: ____________________ or ____________________
Fill in the blank with correct words.
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Answer the following statement true (T) or false (F)