Scientists recently succeeded in drilling through the crust to reach the mantle.
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Q90: Pangaea is currently dated at
A) 4.6 billion
Q91: The principle of isostasy refers to the
Q92: Silt and clay are likely to be
Q93: Earth's magnetic field is generated from within
Q94: The uppermost mantle is a plastic, whereas
Q96: Which of the following is false?
A) The
Q98: The sea-floor spreading center that led to
Q146: Any rock, either igneous or sedimentary, may
Q153: The crust is thickest under mountains and
Q163: The geologic cycle is powered both by
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