You see a hot-spot volcano on the surface of the Earth. What is under this volcano?A.A rising tower of hot rock from deeper in the mantle, and perhaps all the way from the bottom of the mantle.B.
A spreading ridge, where sea floor is made.C.A subduction zone, which brings up rock from deep in the mantle.D.A subduction zone, where volcanic arcs are made.E.A Pepsi machine.Earthquakes make sound waves that go through the whole Earth, and go slower through hotter, less-dense rocks. By setting out listening devices called seismometers around the Earth, and listening to the waves from many earthquakes in many places, scientists can map the hotter regions, and find that towers of hot rock come up from way deep in the Earth in some places. But, some other hot spots, while clearly coming up from below, don’t seem to start quite as deep.Points Earned:1/1Correct Answer:AYour Response:A7.Most commonly, a hot-spot volcano:
8.Look at the picture above. What happened here?A.Death-Valley-type faulting dropped the bottom, making space for the lake; during the Ice Age, Death Valley looked like this, too.B.A sharp bend in a river created a whirlpool that carved the hole now filled by a lake.C.A great volcanic explosion occurred, spreading material across the landscape and leaving a hole.D.An immense marmot named George, shown here, dug the hole.
You've reached the end of your free preview.
Want to read all 14 pages?
- Fall '08
- Earthquakes, Correct Answer, Volcano