Friction is not restricted to solid objects; it occurs in moving fluids as well
a. True
b. False
ANSWER: True
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Where on the Population Density map of Sub-Saharan Africa would you find the highest densities of people in this region?
A. Western Africa, including Nigeria B. Southern Africa, from Botswana to Angola C. Ethiopia and Somalia in Eastern Africa D. The Northern African boundary countries along the Sahara Desert
The region of the Siberian Plain frozen for nine months annually and where cold-resistant vegetation grows is known as:
A) tundra B) taiga C) steppe D) Volga E) none of these
The Earth's magnetic field is generated by
A) salty water moving through the deep parts of the crust. B) convection currents in the asthenosphere. C) movement of iron and electrical currents within Earth's outer core. D) aligned magnetic minerals within Earth's inner core.
Sinkholes only form very gradually
a. True b. False Indicate whether the statement is true or false