What are some difficulties that must be overcome before deep-ocean floor mining can take place? What will be an ideal response?
ANS:Apart
from international disputes that might arise over who owns what, there are some technical and
environmental concerns that should be addressed. The physical devices needed to recover ore from the
ocean floor are the stuff of science fiction in the sense that the location is as hostile to humans as outer
space. Submersibles are much like spacecraft. The main question is how to economically transport
"ore" up through a water column that is many kilometers deep. Environmental concerns center on
pristine and unique life forms that cluster around thermal hot springs on the ocean floor. These are the
same hot springs that concentrate valuable minerals. Mining is a potential threat to these life forms.
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Which of the following locations shows the best development of a Rossby wave ridge?
A) A
B) B
C) C
D) D
What is an atoll?
A) polar desert B) high island C) low, coral island D) glacier island E) bushfire
A bullet is fired horizontally with an initial velocity of 300 m/s from a tower that is 20 m high. If air resistance is negligible, the horizontal distance the bullet travels before hitting the ground is
A) 200 m. B) 300 m. C) 400 m. D) 500 m. E) 600 m.