The feature formed when a river dumps its sediment near its mouth is called a
A. meander.
B. oxbow lake.
C. delta.
D. point bar.
Answer: C
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The Earth's magnetic field has reversed itself many times in the geologic past. Indicate whether the statement is true or false
What is the petroleum found in marine sediments likely to have been formed from?
A) Bacteria B) Fossilized fish C) Whale falls D) None of these choices
If the precautionary principle had been applied to the evidence of the dangerous health effects of smoking tobacco from the 1950s to the 1970s,
A) we would still be waiting for the final word and no government actions would have been taken. B) tobacco companies would have been given much more time to research the health effects before any government regulations were passed. C) cigarette manufacturers would have been required to demonstrate by acceptable scientific procedures that smoking was safe and government regulations would have come much earlier. D) more tobacco products would have been sold.
Which term describes species that play crucial roles in helping to keep their ecosystems functioning?
A. cornerstone B. foundational C. keystone D. critical E. primary