This process involves the movement of a mass or substance
conduction
convection
radiation
all of these
convection
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American beavers, Castor canadensis, are widespread in North America. Those American beavers living around lakes in northern Minnesota and that can potentially interbreed
A) are probably another beaver species. B) represent one population of American beavers. C) likely look much different than beavers in Wisconsin. D) belong to the same family but not the same genus as other beavers.
A glacier behaves more like a plastic than a rigid body
Indicate whether the statement is true or false
The arrows drawn perpendicularly to the contour lines on the contour map shown indicate the direction of the groundwater flow. In this example the groundwater is
A. flowing down the slope of the water table from higher contours to lower ones. B. flowing parallel to the slope of the water table from lower contours to higher contours. C. flowing up the slope of the water table from lower contours to higher contours.
The radioactive gas that poses an indoor air-pollution problem is
A. ozone. B. radon. C. argon. D. organic.