Oceanic crust is composed primarily of ________
A) sandstone B) andesite C) granite D) basalt
D
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The physical and human geographies of North America are greatly affected by the region's surface _______________.
Fill in the blank(s) with the appropriate word(s).
A difference in air density can cause
A) refraction. B) reflection. C) scattering. D) absorption.
What are groundfish?
A) various species that are found in estuaries B) fish that are ground up and used for bait C) fish that form the base of the food web of deep?water habitats D) various species that live in benthic habitats, such as halibut and flounder E) various species that live in littoral habitats, such as tuna and whitefish
Approximately what percent of the world's irrigation water is from groundwater?
A) 15 percent B) 25 percent C) 50 percent D) 80 percent