Streams erode downward until they reach ________
A) their base level
B) their profile
C) an oxbow
D) the floodplain
Answer: A
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There is a tremendous amount of gold dissolved in the ocean. Why is this amount not included when totaling the worldwide gold reserves?
A. It is uneconomical to extract. B. International regulations prohibit it. C. There is a lack of technological know how. D. There are environmental concerns.
The time interval for the Hadean Eon is 4.57~3.85 Ga.
a. true b. false
The language family encompassing the languages of the People's Republic of China is
A) Indo-European. B) Indo-Iranian. C) Mandarin. D) Sino-Tibetan. E) Austro-Asiatic.
Water vapor, like carbon dioxide, plays a large role in the insulating properties of the atmosphere
a. True b. False Indicate whether the statement is true or false