Geologists call the downslope movement of material under the direct influence of gravity
____________________. Fill in the blank(s) with the appropriate word(s).
mass wasting
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The fluid-filled structure that helps to cushion and protect a developing embryo is the
A. zona pellucida. B. blastocyst. C. placenta. D. amnion.
Intraregional migration in the United States has slowed recently because of
A) lifestyle choices. B) the economic recession. C) a desire for detached houses with private yards. D) job growth in urban centers. E) a counterurbanization trend.
Melting and refreezing of snow acts to __________ ice density and __________ the sphericity (roundness) of the original snowflakes.
A) increase; increase B) increase; decrease C) decrease; increase D) decrease; decrease
Hydrogen bonding plays an important role in which of the following?
A) the boiling point of water B) the expansion of water upon freezing C) both a and b D) neither a nor b