The U.S. General Mining Law of 1872 was in effect until
a. 1873
b. 1900
c. 1950
d. 1995
e. This law is still in effect today.
D
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The symbiotic dinoflagellates that live in the tissues of coral polyps ____.?
A) ?provide carbon dioxide and phosphates for the polyps B) ?feed on the tissues of the polyps and are dangerous parasites C) ?are the main cause of coral bleaching, and are threatening the reefs of the world D) ?provide additional nourishment and oxygen to the polyps through photosynthesi
Drip irrigation systems are
A) less efficient than traditional flood or center-pivot systems. B) cheaper, compared to traditional flood or center-pivot systems. C) producing greater crop yields. D) used for most irrigation of crops in the United States.
A lahar is a(n) ________.
A. small piece of pyroclastic material B. extinct volcano C. felsic magma deposit D. volcanic island chain E. volcanic mudflow
How would salinity of the oceans vary if the oceans were twice as deep as present and held approximately twice as much water?
A. Salinity would be the same as present. B. Salinity would be less than present. C. Salinity would be greater than present.