A model for Earth elevation based on oceanic crust being thinner than continental crust and oceanic crust being denser than continental crust results in
A) continental crust and oceanic crust having the same densities.
B) continental and oceanic crust being too thick.
C) continental crust being denser than oceanic crust.
D) reasonable estimates of crustal thickness and crustal densities.
Answer: D
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A pair of identical blocks are joined by a length of string on a friction-free table. When one block is pushed off the edge of the table, the taut string drags the other block horizontally across the table surface with an acceleration of
A. between zero and g. B. zero. C. g/2. D. greater than g. E. g.
Why can geologists observe the breaking of the ground during an earthquake much easier than other geologic events?
A) Ground breaking during an earthquake is much more violent than other events. B) Geologists have better equipment to measure earthquakes than other geologic events. C) Ground breaking during an earthquake occurs much faster than other events in the geologic history of the earth. D) Geologists enjoy earthquakes more than other geologic events.
Volcanic activity that takes place away from plate boundaries is the result of volcanism at a(n)
____________________. In the U.S., an example of this type of volcanism in the ocean is ____________________; an example on land is __________________ Fill in the blank(s) with the appropriate word(s).
Each year, U.S. fire departments respond to more than ____ fires started by lightning in the United States.?
a. ?2,000 b. ?50,000 c. ?10,000 d. ?20,000 e. ?50,000