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Related Flashcards
Cards In This Set
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In Wegener's evidence for continental drift, continents were proposed to fit together, such as the east coast of South America with the ____________
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Lower west coast of Africa
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What word means unsorted material deposited directly by glacial ice and showing no stratification?
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Till
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Glacial _____________ are scratches or gouges cut into bedrock by glacial movement.
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Striations
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Evidence that glaciers once covered an area might include _________.
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Till and striations
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Abundant swamps led to the formation of coal during the Late Paleozoic in which of the following places?
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North America
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Wegener's idea of continental drift was rejected by American geologists because _____________.
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He could not conceive of a valid mechanism that would cause continents to shift positions.
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If a geologist discovered coal in a modern-day cold, snowy location, he or she could conclude that ___________.
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The area was once covered with swamps and/or jungles .
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If a geologist discovered striations (scratches) on bedrock surfaces and small hills compared of poorly sorted sediment, what could he or he conclude about the area?
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The glaciers had once covered the area.
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Limestone reefs and salt deposits are important rocks in the the reconstruction of Earth's history because they _________________.
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Can be used to infer the ancient climate of Earth; they are deposited in environments that are restricted to warm climates.
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The apparent tendency of the north (or south) magnetic pole to vary in position over time is termed ________
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Polar wander
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What does an ordinary compass mean?
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Magnetic north
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In the geologic past, the polarity of Earth's magnetic field is _______.
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Known to have experienced numerous reversals, as shown by remnant magnetization of iron-rich minerals in rocks
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Seafloor spreading _______________.
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Creates new oceanic crust
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