111998
| Question | Answer |
| What is the outer layer of the earth called? | Lithosphere |
| Draw the structure of the earth. |
Image:
558822-50521-49 (image/jpg)
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| Lithosphere is made up of ... | ...Tectonic plates |
| How do we know what is beneath the crust? | Seismic waves and man-made explosions. |
| What does the mantle lie between? | Core and the crust. |
| The earths core transfers energy so... | ...the temperature increases with depth. |
| Convection currents... | ...slowly move plates. |
| Describe subduction. |
Image:
recycle.gif (image/gif)
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| Why is the theory of plate tectonics now widely accepted my scientists? | It explains a wide range of evidence and it has been discussed and tested by many scientists. |
| Who's theory was not accepted? | Wegner's continental drift theory in 1914 |
| How did it slowly become accepted? | Sea floor spreading evidence in the 1960's. |
| Why does magma rise up? | It is less dense than the crust. It causes volcanoes. |
| Magma can have different... | ...compositions....eruptions. |
| Why do geologists study volcanoes? | To predict eruptions in the future. |
| How are different types of igneous rock formed? | Lava |
| What does runny lava produce? | Iron-rich basalt rock. (slower eruptions) |
| What does thick lava produce? | Silica-rich rhyolite rock. (explosive eruptions) |
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