Of the four agents of erosion-water, wind, and ice-the one that can move only small-sized sediments is
A. wind.
B. water.
C. ice.
D. all of these
Answer: A
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Edwin Hubble discovered that the farther away a galaxy is the
A. more black holes it contains. B. faster it is receding from us. C. more massive it is. D. more energetic it is.
Until the Industrial Revolution of the late 1700s, the volume and velocity of world trade were constrained by technologies limited to those based on
A) wood, wind and water. B) coal, steel and rail. C) oil, plastics and roads. D) human labor and animal power.
Which of the following is NOT true of magma?
A) Magma is generated by the movement within Earth and between plates. B) Magma migrates toward the surface because it is less dense than the surrounding rock. C) Magma is called lava when it reaches the surface and erupts. D) Magma forms sedimentary rocks upon cooling.
Throughout the world, there is general agreement that the safest place to store long-term nuclear waste is
A) in the major oceans. B) in space. C) in high security above ground buildings. D) deep underground.