The first life to originate on Earth must be
A) at least as old as the oldest fossils
B) exactly the same age as the oldest fossils
C) younger than the oldest fossils
D) much older than the oldest fossils
A
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A light-year is
A) about 10 trillion kilometers. B) the time it takes light to reach the nearest star. C) the time it takes light to travel around the Sun. D) about 300,000 kilometers per second.
Two cars suffer a head-on collision. What is conserved in the collision?
A) mechanical energy and momentum B) kinetic energy C) momentum D) (Neither energy nor momentum is conserved.)
Water at 4°C will expand when it is slightly
A) cooled. B) warmed. C) both of these D) none of the above
The wearing away of soil and rock and the subsequent downslope movement of the fragments are called
a. erosion. b. weathering. c. cross-cutting. d. deposition.