What is the drainage density of a 100 drainage basin with 25 miles of stream, running through three rivers?
A) 3
B) 33.333
C) 4 mi./mi2
D) 0.25 mi./mi2
D
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A(n) ____ is a test involving manipulations made on conditions of a particular observation
a. hypothesis b. experiment c. theory d. scientific method
The Greenhouse gas with the greatest greenhouse potential is ________.
A. CFC-11 B. Methane C. CFC-12 D. Ozone E. Carbon dioxide
Which of the following statements are FALSE about shifting cultivation
A) People clear a patch of land and burn the rubble. B) The soils on these patches are depleted rather quickly. C) The soils usually become permanently infertile. D) After the soil in one patch is depleted, the farmers move on to clear another. E) None of the above is false about shifting cultivation.
Which fossils provide information as to the mode of formation of an oxygen-rich atmosphere by about 2 billion years ago?
A. dinosaurs B. stromatolites C. trilobites