science quiz
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Created by:
steviepliss on December 1, 2010
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10 terms
Terms | Definitions |
|---|---|
 during the 1940's or 1950's scientists began using .................... on moving ships to map large areas of the ocean floor in detail. | sound waves or sonar. |
| the youngest rocks are found ............... from the mid-ocean ridges. | near. |
| the scientist Henry Hess invented ................................... | the theory of seafloor spreading. |
| as the seafloor spreads apart, hot ....... moves ......... and flows from the cracks. | 1.magma 2.upward |
| as the new seafloor moves away from the ridge and ............................ forms still higher ridges. | cools, and becomes more dense and sinks. |
| the reasearch ship glomar challenger was equipped with a drilling rig that .......................................... | allowed scientists to drill into the seafloor to obtain rock samples. |
| rocks on the seafloor are much ............................ than mazny continental rocks. | younger |
| when plates collide the denser plate will .................. the less-dense plate. | sinks under (subtucts). |
| earths magnetic field has ..................................................................... | reversed itself many times. |
| the magnetic alignment in rocks on the ocean floor................................................................... | reverses back and forth. |
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