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Plate Boundaries
Sci test
| Term | Definition |
|---|---|
| Continental Drift | Hypothisis that states that the continents once formed a single land mass (PANGAEA), then broke apart, and drinfted to where they are today. |
| Alfred Wegener | Proposed his hypothisis for continential drift in 1912 |
| Evidence for Continential Drift | 1) Continents fit like a puzzle 2) Fossils of plants plants and animals found on different continents 3) Similar Climates (Ice Age - Glaciation, Coal in antarctica 4) Similar landforms and rock patterns |
| Problems | 1) No mechinism for movement 2) Wind and Water could have carried it 3) Other scientists didin't belive him |
| Harry Hess | Proposed the Theory of Sea-floor Spreading in 1960. |
| Sea Floor Spreading | the process by which new oceanic lithosphere forms as magma rises toward the surface and solidifies |
| M.O.R (Mid Ocean Ridge) | the longest mountain chain in the world and a divergent boundary |
| Maping of the Ocean Floor | Sonar |
| Subduction | Where the Denser crust will sink into the astenosphere at a deep ocean trench in a process called subduction |
| They cycle reapeats like a _________ | |
| 3 pieces of evidence | 1) New molten material is erupting along the MOR 2) New/Younger rock was found at the MOR while older rocks are found further away from it. 3) The magnetic strip patterns on both sides of the MOR matched. |
| If the sea-floor is spreading and growing, wouldn't the earth be getting larger? | The Earth does NOT keep growing wider and wider because of subuction. Remember, this is where the ocean floor sinks beneath a deep ocean trench and back into the mantle. |
| If 2 continential land masses run into each other it is called _____ | Convergent Boundary |
| If 2 continential land masses split apart and make a valley that is called _________ | Divergent Boundary |
| If 2 land masses slide past each other That's called ________ | Transform Boundary |
| Example of Transform Boundary | San Andreas Fault |
| Example of a Divergent Boundary | Great Rift Valley |
| Example of a Convergent Boundary | Mt. Everest |
| What convergent arrows look like | -----><----- |
| What divergent arrows look like | <---- ----> |
| What transform arrows look like | ----->(arrow on top) <-----(arrow on bottom) |
Created by:
joshy4141
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