Rare in crustal rocks, but abundant in some meteoroids, the presence of a(n) ____________________ layer provides
evidence for a meteorite impact at the end of the Mesozoic Fill in the blank(s) with the appropriate word(s).
iridium
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Which of the following is a present-day example of a continental rift?
a) the West African rift valley b) the North American rift valley c) the South American rift valley d) the East African rift valley
Soil fertility depends primarily on bedrock type
Indicate whether the statement is true or false
Agricultural fields that must constantly be irrigated to sustain a crop especially in semi-arid regions like the American southwest will eventually
A) produce sinkholes. B) lose most of their minerals and salts. C) accumulate toxic levels of salts from evaporation. D) produce soils that will not hold water, leading to desertification.
Glacial surges may be associated with
A) soft bed below the glacier. B) lubrication from meltwater. C) water pressure under the glacier. D) water pressure, soft bed, or lubrication.