In order for symmetrical patterns of magnetic polarity to be produced in the vicinity of a mid-oceanic ridge:
a. new crust has to be produced continuously at the ridge
b. the oceanic crust must move away from the ridge in opposite directions
c. the earth's magnetic field must periodically reverse itself
d. all of the above
d
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Pleistocene glaciers covered about three times as much of Earth’s surface as glaciers do now. Indicate whether the statement is true or false
Our ____ is a rough measure of the volume of freshwater that we use or pollute, directly and indirectly, to stay alive, and to support our lifestyles.
A. watershed B. drainage basin C. water footprint D. zone of saturation E. water table
Worldwide, today there are more obese people than malnourished ones
Indicate whether the statement is true or false
Of the following rocks, the one that is metamorphic is
A. rhyolite. B. granodiorite. C. garnet schist. D. olivine basalt.