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Geography, 24.07.2019 22:30 danielle1572

During the pleistocene glaciation, there have been numerous glacial and interglacial stages. about how long on average do these glacial stages reach their peak?
select one:
a. 10,000 years
b. 1,000,000 years
c. 100,000 years
d. 1000 years
question 68
which of the following glacial periods is believed to have occurred just prior to the explosion of life on the planet we call earth?
select one:
a. karoo
b. huronian
c. sturtian
d. marinoan
question 69
which one of the following statements concerning glacial deposits is not true?
select one:
a. tills are poorly sorted and the fragments are mostly angular
b. outwash is mainly stratified sand and gravel.
c. glacial erratics are blocks of rock that are too large for the glacier to move.
d. till is deposited directly from the ice; outwash is deposited by melt water streams.
question 70
about how long ago did antarctica begin to freeze over?
select one:
a. about 1 billion years ago
b. its always been frozen
c. about 35 million years ago
d. 2 million years ago
question 71
all of the following are thought to possibly contribute to the formation of glaciers except for
select one:
a. precession
b. eccentricity
c. obliquity
d. icy comets

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During the pleistocene glaciation, there have been numerous glacial and interglacial stages. about h...

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