Sea change 3
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26 terms
Terms | Definitions |
|---|---|
 Plate tectonics | plates move due to varying convection currents in Earth in varying directions, plates always in relative motions (rigid lithospsher, crust created at mid ocean ridges and destryoed at subduction zones) |
| Interior of Earth | crust, mantle, outer core, innner core |
| First Atmosphere | gases part of nebular cloud that condensed to form solar system, gravity couldnt hold these gases closely around earth, first atmosphere lost |
| Second atmosphere | formed by volcanic outgassing, transferred volatile components from interior into earths atmosphere. mostly water vapor and carbon dioxide. |
| Present day volanic erruptions release... | water, c02, nitrogen, sulfur |
| Third atmosphere | todays atmosphere, large amount of water and c02 removed replaces by nitrogen and oxygen. |
| 3rd atmosphere link to oceans (in respect to c02) | c02 dissolved in water to form calcium carbonate and and organic matter. burial of this organic matter and calcium carbonate drew down atmosphereic c02. |
| What does CaC03 and acid form | Carbon dioxide |
| Photosynthesis | water +c02 +energy ---> organic matter and oxygen. |
| 3 main gases in the atmosphere | nitrogen, oxygen, water |
| Greenhouse gases | water vapor, methane, carbon dioxide, argon. keep earths climate from being unbearably cold |
| Troposphere "8 miles high" | most dynamic place in atmosphere. life lives, weather occurs (first layer of atmosphere) . temperature gets colder as you go up. 20 miles thick 32 km |
| Stratosphere | Above troposphere. temperature go upward. |
| ozone | located in between troposphere and stratosphere |
| Why are poles cold and equator hot? | because of the angle the earth is at the equator gets more direct radiation |
| Earths atmosphere | 80 nitrogen 20 oxygen |
| Sea floor spreading | Harry Hess, mechanism for continental drift |
| Vine Matthews | seafloor spreading anomolies |
| Geological Clock | humans appeared one second ago. (6-7 million years ago) |
| Natural selection | differential reproductive success |
| Atmosphere is comparable to | varnish on a globe. relativaly thin |
| No free oxygen until when | 2.5 GA |
| Phtosynthesis | produces oxygen and draws down c02 |
| burial of organic matter.... | draws down atmospheric c02 |
| burning of organic matter | raises atmosphere c02 |
| Average insulation for Earths surface | 342 watts per square meter |
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