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52. What does a terminal moraine represent?<br />
a) the end of a polished and scratched segment of bedrock<br />
b) the sharp ends of a jagged ridge formed by glaciers<br />
c) the end of an ice sheet that is floating in the sea<br />
d) a pile of sediment deposited at the end of the glacier<br />
e) the final time that two glaciers come together<br />
53. The size of clasts that a river can carry is primarily controlled by:<br />
a) the water temperature<br />
b) the dissolved and suspended load of a river<br />
c) how close the river is to the ocean<br />
d) the velocity and turbulence of the current<br />
e) whether it is a permanent or ephemeral stream<br />
54. Which of the following is NOT accurately dated at between 4 and 4.6 billion years old?<br />
a) the oldest dates on mineral grains on Earth<br />
b) age of the oldest meteorites<br />
c) the age of some granites and gneisses<br />
d) age of moon rocks returned to Earth and dated<br />
e) isotopic ages on Earth’s oldest known fossil shell<br />
55. Which of these numbers is near a site with<br />
active seafloor spreading?<br />
a) 1<br />
b) 2<br />
c) 3<br />
d) 4<br />
e) none of these<br />
56. What setting has the thinnest cover of sediment in the oceans?<br />
a) mid-ocean ridges<br />
b) abyssal plain<br />
c) oceanic trenches<br />
d) diapiric deeps<br />
e) continental shelves and slopes along passive margins
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