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Chpt. 5 Lesson 2
Plate Tectonics
| Question | Answer |
|---|---|
| I am a scientist who examines rocks to find out about earth history and structure...who am I? | geologist |
| What occupation is a geologist? | scientist |
| What do geologists study? | earth history and structure |
| How do geologist study earth history and its structure? | by examining rocks |
| What is Wegener's idea called? | theory of continental drift |
| What does the theory of continental drift say? | Millions of years ago the Earth's continents were joined together like a jigsaw puzzle, but they pulled apart to where they are today. |
| What types of evidence have scientists found that support the theory of continental drift? (2) | 1. rocks on the eastern mountains in South America are the same type and age as the rocks on the western side of Africa 2.plant and animal fossils |
| Explain the evidence about the plant and animal fossils that support the theory of continental drift: | A freshwater reptile,the mesosaurus, has been found in rocks in South America and Africa. It could not have swum in the ocean's salt water; could have traveled across the land in freshwater. Would have meant that S. America and Africa were connected. |
| The conclusion many scientists have reached is that South America and Africa were once a supercontinent called what? | Pangaea |
| When South America and Africa floated apart what water filled the space between them? | Atlantic Ocean |
| I am the squeezing or pushing together of the continents' crust...what am I? | compression |
| When a continental plate is being compressed, what happens? | The ground is forced upwards and folded mountains are produced. |
| When one plates rubs past another plate, what is this movement cause? | shear |
| Explain the movement called shear? | a force that twists, tears, or pushes one part of the crust against another |
| Shear can cause Earth's crust to break along what? | fault |
| What happens during a shear along a fault? | one side of the fault moves up and the other side moves down producing fault block mountains |
| Name a group of mountains in the western United States that are fault block mountains: | Sierra Nevada |
| Name some folded mountains in India and Asia? | Himalayas |
| What makes magma rise? | when the plates are moving apart this causes the magma to be pushed from the mantle toward the surface |
| I am a theory that explains how forces deep within Earth can cause ocean floors to spread and continents to move...what am I called? | plate tectonics |
| I am hot melted rock below Earth's surface...what am I? | magma |
| I am a deep crack in Earth's crust...what am I called? | fault |
Created by:
karlyr
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