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
Answer: A
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Suppose the wind speed increases from 8 km/h to 40 km/h. Which of the following expresses the factor by which the force of the wind will have increased?
A. 2 B. 4 C. 5 D. 25
What partly explains the seabed topography we observe?
A) The jostling due to plate tectonics. B) The greater density of continental lithosphere. C) The presence of continental margins. D) The little interaction with the asthenosphere.
Japan's 55 nuclear power plants are susceptible to tsunami damage because they
A) fail to meet basic structural criteria for safety. B) are all located along coastlines for easy access to coolant water. C) use nuclear fuels that are water soluble. D) do not shut down either in response to the earthquakes or tsunamis.
Aurora do not occur in the
A) ionosphere. B) thermosphere. C) troposphere. D) mesosphere. E) none of the above