Why is the mass of the earth important to maintain life as we know it?
A) If the earth's mass were greater, we would be bombarded by meteorites and if it were smaller, we would not be able to hold the moon in orbit.
B) If it had more or less mass, the atmosphere would be very different with either too much ammonia and methane or too little oxygen and water.
C) If the earth's mass were significantly different, we would be bombarded by cosmic rays that would strip away our atmosphere.
D) If we had more or less mass, the earth would not have plate tectonics and would be covered entirely by water.
B
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The euphotic zone in the open ocean extends from the surface down to approximately ________
A) 20 meters B) 100 meters C) one kilometer D) one to two kilometers E) two to three kilometers
Tidal power stations operate by using
A. Turbines that spin in the flow of tide water B. The differential heat of inshore and offshore waters C. The energy from waves as they crash on the shore D. Electrolytic decomposition of saltwater E. All of these together
Stream erosion and deposition are controlled primarily by a river's velocity.
Answer the following statement true (T) or false (F)
If the nuclear-power option were pursued vigorously with current commercial reactor technology and regulatory requirements, all U.S. electricity needs could be supplied by nuclear power in the next 5-7 years.
Answer the following statement true (T) or false (F)