The Moon and Sun cause the tides in Earth's oceans because of
A. gravity.
B. magnetic pull.
C. heat.
Answer: A
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If a river had a 10-year flood this year, it could also have a 10-year flood next year
a. True b. False Indicate whether the statement is true or false
When a chemical change occurs, the event is usually accompanied by _____.
a. The release of energy b. Spattering or boiling c. A physical change d. The evolution of gas
What is the relationship between plucking and abrasion on a glacially scoured landscape?
A) Plucking occurs relatively suddenly when a glacier first encounters the landscape, and then if it remains in place for a long time, abrasion begins to happen later over a long period of time. B) Abrasion occurs relatively suddenly when a glacier first encounters the landscape, and then if it remains in place for a long time, plucking begins to happen later over a long period of time. C) Plucking occurs on the upflow side of a mound or hill that is scoured, while abrasion occurs on the downflow side. D) Abrasion occurs on the upflow side of a mound or hill that is scoured, while plucking occurs on the downflow side.
"Physiological density" is a term applied to human populations that means
A) the number of people per unit of area. B) the strength of the local football team. C) the density of population per unit of arable land. D) the standard of living in any given place. E) that a region is overpopulated.