As a distributary channel in a delta becomes choked with sediment, the water in the channel
A) disappears.
B) will find a new route to its destination.
C) will puddle and eventually form a lake.
D) will move back upstream.
Answer: B
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Why do we think Mars had more volcanic activity in the past than it does today?
a. Mars was bombarded with more impacts in the past, which fueled more volcanic activity. b. Mars’ interior would have been warmer in the past. c. Some meteorites from Mars come from relatively young lava. d. All of the above. e. b and c.
Three long, straight, parallel wires each carry a current of 10 A in the positive x direction. If the distance between each wire and the other two is 10 cm, what is the magnitude of the magnetic force on a 20-cm length of either of the wires?
a. 57 ?N b. 40 ?N c. 69 ?N d. 50 ?N e. 20 ?N
How does the explosion of a nuclear bomb provide evidence of the theory of relativity?
A) The bomb causes things in its vicinity to move at very high speeds, allowing scientists to measure effects of time dilation. B) The mass of the bomb when it explodes is much greater than its normal mass. C) The bomb shortens the lifetimes of all people who happen to be near it when it detonates. D) The bomb produces energy in accord with E = mc2, which is part of the theory of relativity.
Ancient people who knew the saros cycle could
A) predict when they'd see the next total solar eclipse in their area. B) predict what type of eclipse would occur. C) completely predict every lunar eclipse. D) predict when an eclipse would happen, but not necessarily what type and where it would be visible. E) completely predict every solar eclipse.