Second to petroleum and natural gas, the most profitable physical resource recovered from the marine environment is ____
A) precious metals
B) diamonds
C) sand and gravel
D) coal
C
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Sills are:
a. composed of extrusive igneous rock. b. mushroom-shaped flows of basalt. c. vertical walls of intrusive igneous rock. d. horizontal sheets of intrusive igneous rock. e. the largest type of igneous intrusion.
The residence time for water in any of Earth's principal reservoirs can be calculated by dividing ________.
A. rate of water removal by water supply B. rate of water removal by reservoir volume C. reservoir volume by rate of water supply D. None of these is correct. E. reservoir volume by rate of water supply, rate of water removal by reservoir volume, and rate of water removal by water supply
A key characteristic of igneous rocks is that they ____
A)are the youngest rocks on Earth B)are made up of minerals that crystallized from molten rock matter called magma C)never contain iron or magnesium D)are not as hard as sedimentary rock E)always contain more than three different mineral types
Agglomeration economies accounted for the manufacturing activity in the North American Manufacturing Belt
Indicate whether the statement is true or false