If material is to move down slope, it must overcome the force of
A) inertial resistance of the material only.
B) the cohesion of particles to each other only.
C) friction only.
D) both friction and inertial resistance.
E) friction, cohesion of particles, and inertial resistance.
E
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Geography is a theoretical science with few practical applications to real world problems and issues
Indicate whether this statement is true or false.
How far must one travel to get away from Earth's gravitational field?
A) to a region above Earth's atmosphere B) to a region well beyond the Moon C) to a region beyond the solar system D) Forget it; you can't travel far enough.
Hydroelectric power generation ________
A) is an alternative to fossil fuels that produces fewer greenhouse gases B) uses fuel cells to generate electricity C) has no undesirable environmental effects D) produces pollutants that contribute significantly to acid precipitation E) produces high quantities of greenhouse gases
The continental ice sheets over North America disappeared ____
a. between about 9,000 and 6,000 years ago b. approximately 14,700 years ago c. about 2.5 million years ago d. between about 5,000 and 4,000 years ago e. about 1300 years ago