Erosion by alpine glaciers creates
A) V-shaped valleys.
B) U-shaped valleys.
C) drumlins.
D) moraines.
Answer: B
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Indicate whether the statement is true or false
The Andes and the Sierra Nevada Mountains began to form during the Mesozoic due to
A) the formation of the Atlantic Ocean. B) subduction of Pacific oceanic crust beneath North and South American continental crust. C) rifting between North America and Africa. D) meteorite bombardment in Mexico.
A box is pushed across a horizontal table at constant speed. Of the forces on it, which pair do we know are equal in magnitude because of Newton’s third law?
A. Normal force on the box and the weight of the box. B. Normal force on the box and the normal force on the table by the box. C. The force of kinetic friction on the box and the force applied to the box by the one pushing it. D. None of these are interaction pairs.
Light travels slightly slower in the
A) upper atmosphere. B) lower atmosphere. C) neither of these