Why would using the continental shelves to reassemble the continents provide a better fit than using the shorelines of the continents?
What will be an ideal response?
Answer: The shorelines are continuously eroded by waves or are being built out by longshore currents, fluvial deposition, and so on. These processes change the shapes of the continents over time. The continental shelves are currently several hundred feet below the erosive power of the waves, so they are left relatively untouched.
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What is happening in the mantle beneath a subduction zone?
a. Hot mantle rock is rising, pulling down a cold ocean slab. b. Cool mantle rock is rising, pulling down a warmer ocean slab. c. The mantle is molten and the subducting slab sinks into it. d. Relatively cool mantle rock is sinking, pulling down on a cold ocean slab. e. Hot mantle rock is sinking, pulling down on a warm ocean slab.
The lag time between peak rainfall and peak stream discharge is typically increased by urbanization
Indicate whether the statement is true or false
Albedo is most closely related to
A) absorption. B) transmission. C) scattering. D) refraction. E) reflection.
Which of the following is NOT correct regarding coral bleaching?
A) The warming of sea-surface temperatures is a great threat to coral. B) The 1998 El Niño event caused the die-off of an estimated 30% of the world's reefs C) Scientists have identified the reasons polyps eject their algae. D) Coral reefs are under pressure from overfishing, pollution, sedimentation, and global warming.