| A | B |
|---|
| Proposed the theory of Seafloor Spreading | Harry Hess |
| Earth's plates move apart and others collide, forming ____. | mountainsm volcanoes, ocean basins |
| The youngest rocks in the ocean floor are located at the mid-ocean ____. | ridges |
| The results of plage movement can be seen at ____. | rift valleys and plate boundaries |
| The ___are formed at the Indo-Australian plate when it collides with the Eurasian plate | Himalayas |
| The presence of the same ___ on several continents supports the idea of continental drift. | fossils and rocks |
| Continental drift occur because of___. | seafloor spreading |
| The cycle of heating, rising, cooling, and sinking is called____. | 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 rock reflect that the Earth's ___has reversed. | magnetic field |
| The lack of an explanation for continental drift prevented scientists from believing in the supercontinent called ___. | Pangaea |
| The Glomar Challenger collected ____ which added evidence for the theory of seafloor spreading. | samples of rock from different locations |
| Where plates slide past one another, ____ occur. | earthquakes |
| The places between plates moving together are called ___. | convergent bounderies |
| Seafloor spreading occurs because___. | hot, less dense material below the Earth's crust is forced toward the surface |
| Studying the ocean floor, scientists found rocks showing magnetic ____. | reversal |
| Earth's plasticlike layer is ____. | asthenosphere |
| Earth's ____ move around on a special layer of the mantle. | plates |
| Lithosphere is made of the oceanic crust or continental crust and _____. | upper mantle |
| Pangaea means ___. | "all land" |
| These mountains were formed at convergent boundaries from a continental plate and ____. | an oceanic plate (The Andes Mountain range) |
| The islands of Japan were formed from ____. | two oceanic plates colliding |
| The Himalayas were formed from ____. | two continental plates colliding |
| The Andes mountain rangesm the Himalayas, and the islands of Japan were all forned alike by ____. | boundaries that converge |
| What happens to warmer material in a convection current? | Warmer material rises |
| ______ was led to develop the hypothesis of continental drift. | Alfred Wegener |
