Why does hot water come out of hydrothermal vents on the flanks of the mid-ocean ridges?
a) Water is released from the mid-ocean ridge magma and oozes out of the crust
b) Flows of hot lava on the sea floor cause seawater to be heated
c) Sea water percolates downward through cracks in the crust, is heated in the hot deeper crust, and rises back up to the surface through other cracks
d) Chemical reactions result in dehydration of the crust when freshwater is in contact with fresh basalt near the mid-ocean ridge
e) Seawater percolates downward in the crust through cracks and flashes to steam on contact with hot lava deep in the crust
Question 2
What is the purpose of hard stabilization?
a) To decelerate coastal winds
b) To increase biodiversity along a coast
c) To protect a coast from erosion
d) To be used as an alternative to groin fields
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