What causes high and low tides?
A. the tendency for water on a spinning globe to be thrown outward
B. daily heating and cooling of the seas, which causes seawater to contract and expand
C. water is pulled by the gravity of the Moon
D. a rise in sea level during the day because of an increase in storms
E. All of these choices are correct.
Answer: C
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Which of these coastal systems is crucial to marine biodiversity, and in tropical areas of the world, serves as a habitat for an astonishing variety of marine animals?
A. coral reefs B. mangrove forests C. coastal marshes D. estuaries
In which two Stages of the Demographic Transition are the RNI low?
A) Stages 1 and 2 B) Stages 2 and 3 C) Stages 1 and 3 D) Stages 1 and 4 E) Stages 3 and 4
Why are birthrates declining in some countries in Southwest Asia and North Africa?
Despite the cultural differences with North America, what common processes seem to be at work in both regions that have contributed to this demographic transition?
Use the following diagram to answer this question.
Which of the images best represents the plate boundary between the South American and African plates?
A. Diagram a B. Diagram b C. Diagram c D. Diagram d