The geological record contains fewer older rocks than younger rocks because older rocks
A) are mostly found deep within the Earth
B) have been transformed by life processes that have occurred inside them
C) have been destroyed by geological processes like plate tectonics and erosion
D) have been destroyed by recent meteorite impacts
C
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Visible light consists of electromagnetic waves with wavelengths (in air) in the range 400 - 700 nm. What are the frequencies of visible light?
a. 
b. 
c. 
d. 
How is the Moon's orbit around Earth different from most major satellite orbits around other planets?
A. The Moon orbits much faster than other satellites. B. The Moon follows an elliptical orbit around Earth. C. The same side of the Moon faces Earth throughout its orbit. D. The Moon's orbital plane is tipped relative to Earth's equator.
If beam 1 is the incoming beam in the figure below, which of the other four beams are due to reflection?
The accelerating force of the wind on a small 250-kg sailboat is 707 N northeast. If the drag of the keel is 500 N acting west, what is the acceleration of the boat?
a. 1.5 m/s2 due east c. 3.0 m/s2 northeast b. 2.5 m/s2 due north d. 2.0 m/s2 due north