What are the three main types of marine deltas based on? What are they, and how are they different
from each other? What will be an ideal response?
The three types are based on the relative importance of stream, wave, or tidal processes. Streamdominated
deltas have long fingerlike sand bodies, each deposited in a distributary channel that
progrades far seaward. Wave-dominated deltas have distributary channels, but the seaward margin of
the delta is reworked by waves, so the entire delta progrades. Tide-dominated deltas are continuously
modified into tidal sand bodies that parallel the direction of tidal flow.
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What percentage of Earth's water is freshwater?
A. 25% B. 85% C. 3% D. 50%
Which of the following statements is false concerning the 1872 Mining Law?
A. There were no provisions for reclamation or restoration of the mined land. B. Mining companies were not required to inform the federal government of the locations of the deposits they were mining. C. Mining companies were required to pay royalties on the materials mined to the federal government to help pay for the enforcement of the legislation. D. The style of mining was not regulated by the federal government.
Earth's first atmosphere (approximately 4.6 billion years ago) was most likely composed of ____
A) nitrogen and oxygen B) hydrogen and helium C) carbon dioxide and nitrogen D) oxygen and carbon dioxide
What is a mantle plume?
A) The magma that rises up from the mantle at a divergent plate boundary B) Material rising up from a subducting plate going through partial melting C) A form of batholith composed of ferromagnesian materials D) An upwelling of hot material from the Earth's interior that is cylindrical in shape