What is the most important reason why an icy moon is more likely to be geologically active than a rocky moon of the same size?
A) Ice has a lower melting point than rock.
B) Ice is less rigid than rock.
C) Ice contains more radioactive elements than rock.
D) Ice is affected by tidal forces to a greater extent than rock.
E) Ice is less dense than rock.
A
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The Phanerozoic eon is divided into three main
A) epochs B) periods C) eras D) ages
The process of matching up rock layers in different localities by such means as index fossils is called
a. conformational analysis. b. correlation. c. indexation. d. cross-cutting.
Wood from an ancient stump has a ratio of carbon-14 to carbon-12 that is one-eighth that of new wood. About how old is the stump? (Carbon-14's half-life is 5730 years.)
a. 17,190 years b. 11,460 years c. 5730 years d. 2865 years
This sequence of photos shows the Sun at one-hour intervals throughout the day of the June solstice; directions and times are indicated. Where was this photo taken?
A) the Arctic Circle B) the Antarctic Circle C) the North Pole D) the equator