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WAB Science 14

Science Ch. 14

QuestionAnswer
The seafloor spreading theory was produced by ___. Harry Hess
As Earth's plates move apart at some boundaries, they collide at others, forming ___. mountains and volcanoes
The youngest rocks in the ocean floor are located at the mid-ocean ___. ridges
The results of plate movement can be seen at ___. rift valleys
The ___ are forming where the Indo-Australian plate collides into the Eurasian plate. Himalayas
The presence of the same ___ on several continents supports the ideas of continental drift. fossils & rocks
Continental drift occurs because of ___. seafloor spreading
The cycle of heating, rising, cooling, and sinking is called a ___. convection current
Oceanic plates are pushed down into the upper mantle in ___. subduction zones
The hypothesis that continents have moved slowly to their current locations is called ___. continental drift
Plates move apart at ___ boundaries. divergent
Ocean floor rocks are ___ continental rocks. younger than
The alignment of iron-bearing minerals in rocks when they formed reflects the fact that Earth's ___ has reversed itself several times in its past. magnetic field
The lack of an explanation for continental drift prevented many scientists from believing a single supercontinent called ___ once existed. Pangaea
Scientists aboard the Glomar Challenger added to the evidence for the theory of seafloor spreading by providing ___. samples of rock from different locations
Where plates slide past one another, ___ occur. earthquakes
The places between plates moving together are called ___. convergent boundaries
Seafloor spreading occurs because ___. hot, less-dense material below Earth's crust is forced upward toward the surface
Studying teh ocean floor, scientists found rocks showing magnetic ___. reversal
Created by: 1555506048
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