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JCCC EVRN 124 Book Quiz Two Questions and Answers 100% correct
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JCCC EVRN 124 Book Quiz Two
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JCCC EVRN 124 Book Quiz TwoAs early as the 1700s, scientists and observers noticed a remarkable coincidence of
shape of the Atlantic coasts of Africa and ____. - answer South America
Earlier than 200 million years ago, the continents were joined into one supercontinent
called ____. - answer Pangaea
Scientists believe the breakup of Pangaea occurred about ____. - answer200 million
years ago
A cross section of Earth reveals a layered structure that has different thicknesses and
densities. How do geologists know this? - answerFrom observing the transit times
through Earth of seismic waves generated by earthquakes
What is the primary reason for the inside of Earth being hot? - answerThe decay of
radioactive elements is creating heat in Earth's inner layers.
The ____ accounts for 83 percent of Earth's volume. - answerMantle
About how many kilometers (miles) is it from the center of Earth to the crust? -
answer6,370 kilometers (3,980 miles)
The hot, partially melted, slowly flowing layer of Earth is called the ____. -
answerAsthenosphere
The rigid outer layer of Earth that comprises the continental crust, oceanic crust, and
the uppermost mantle is called the ____. - answerLithosphere
What are the primary elements in Earth's continental crust? - answerOxygen, silicon,
and aluminum
The mid-ocean ridges are ____. - answerDivergent plate boundaries
Roughly how fast do most lithospheric plates move? - answerAbout 5 centimeters per
year
California's San Andreas fault is which type of plate boundary? - answerTransform plate
boundary
If two oceanic plates collide and one is older and cooler (and therefore, denser) than the
other, what will happen? - answerA deep trench will form.
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