The Mohorovi?i? discontinuity ____
a. marks the boundary between Earth's crust and mantle
b. has been reached by drilling in the Gulf of Mexico
c. indicates a change in rock type from basalt to granite
d. indicates a change in rock type from igneous to sedimentary
a
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All of the following human activities will increase the sediment load in a river except
A) logging of forests on steep slopes. B) converting cropland to natural vegetation. C) surface mining for coal. D) large-scale construction projects.
System reliability is determined by
A. degree of control. B. technological reliability and human reliability C. toxicology. D. catastrophe. E. acceptance of risk.
The world's largest bauxite deposits, in northern Australia, form in ancient ________ soils
A) forest B) rainforest C) grassland D) desert E) wetland
Trees that keep their leaves through the winter and a ground covered with shed needlelike leaves characterize
A. chaparral. B. tropical forests. C. coniferous forests. D. temperate forests.