Partial melting of the mantle asthenosphere most commonly produces which composition of magma?
Ans: Basalt
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Which of the following is NOT something we can learn by determining isotopic ages?
A. the cooling history by using different types of isotopic ages B. the age when a rock is uplifted toward the surface C. the age of material from which clasts in a sedimentary rock were derived D. the age of a volcanic eruption E. We can determine all of these.
Why is Florida in a tropical climate while Baja California, at the same latitude, is temperate?
a) Florida is sunnier and therefore warmer. b) Ocean currents bring warm water up from the tropics to Florida but cool water down from northern latitudes to Baja. c) Warm winds blow from the south to Florida, but cold winds blow from the north to Baja. d) Hurricanes bring hot, moist weather to Florida, but not to Baja. e) Florida is under the influence of tropical trade winds, but Baja is not.
Which practice would make forestry less sustainable?
a. Leave most standing dead trees and larger fallen trees for wildlife habitats and nutrient cycling. b. Reduce road-building in forests. c. Include ecosystem services of forests in estimates of their economic value. d. Stop clear-cutting on steep slopes. e. Clear old-growth forests for tree plantations.
Popular culture is focused upon masses of people who are engaged in cultural practices that are ________.
A. ethnic and traditional B. urban and traditional C. traditional and rural D. faddish and ever-changing