What causes magnetic stripes on the seafloor, such as those shown here?
A) Volcanic rocks in oceanic crust are covered by a variable thickness of sediment.
B) Some oceanic crust consists of volcanic rocks and some is composed of sediment.
C) Sometimes Earth's magnetic field points north and sometimes it points south.
D) Some volcanic rocks are formed in normal ways and others have pillows.
C) Sometimes Earth's magnetic field points north and sometimes it points south.
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Rain falling from clouds refers to which of the following forms of energy?
A. kinetic B. potential C. latent heat D. radiant
What is NOT a reason that a levee originally built to contain a 100-yr flood would be insufficient?
a. ?Major floods occur more frequently as areas are developed. b. ?Floods larger than a 100-year flood can occur at any time. c. ?Flood levels generally rise over time. d. ?Sediment deposited by tributary streams degrades the levee. e. ?Levees are of varying quality.
The influence of carbon dioxide on the climate is mainly due to its ability to absorb ________
A) water B) infrared radiation C) helium D) argon E) ions
Most commercial loggers prefer "clear-cut" harvesting because it
A. Is the most efficient, cheapest harvest method using large, fast machinery instead of costly labor B. Is the most environmentally sustainable type of harvest C. Does not waste any trees D. Is the most efficient way to get valuable small timber without disturbing the larger early successional trees E. Is the most effective way to refresh soil with sun and rain