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Heat in the Earth

Heat in the Earth. The heat in the Earth is produced from the breakdown (decay) of radioactive isotopes. When these isotopes decay they release a lot of chemical and nuclear energy which generates tons of heat energy. . Plate Boundaries. What is a plate boundary?

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Heat in the Earth

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  1. Heat in the Earth The heat in the Earth is produced from the breakdown (decay) of radioactive isotopes. When these isotopes decay they release a lot of chemical and nuclear energy which generates tons of heat energy.

  2. Plate Boundaries What is a plate boundary? A: Where two plates touch each other. (Like two puzzle pieces) There are three types of plate boundaries. The type of boundary depends on how the plates are moving with each other…

  3. Plate Boundaries: • Divergent These plates are moving away from each other. Plate 1 Plate 2

  4. Plate Boundaries: 2. Transform Fault These plates are sliding along side each other. Plate 2 Plate 1

  5. Plate Boundaries: 3. Convergent These plates are moving into each other. Plate 1 Plate 2

  6. Convergent Boundaries: • There are a couple of different things that can happen at this boundary because there are 2 different types of crust on Earth. • There is continental crust (crust that is mostly above water: land) And • There is oceanic crust...that is under the water. • The continental crust is less dense and thicker than the oceanic crust… so what happens when the two different crusts collide at a convergent boundary???

  7. Convergent Boundaries A: Since the Oceanic crust is more dense it dives beneath the Continental crust = SUBDUCTION ZONE (picture A) A B C

  8. Convergent Boundaries • Continental–Continental collision (picture C) The crust buckles UP and forms large mountains. A B C

  9. Geological Formations At each boundary different geological formations (mountains, volcanoes, trenches, earthquakes, faults, etc.) occur because of the movement of the plates. Lets look at what forms at each boundary…

  10. Geological Formations – DivergentSeafloor Spreading Mid-oceanic ridges and Volcanoes

  11. Geological Formations – Convergent (NO subduction) Large Mountains (in the middle of land)

  12. Geological Formations – Convergent (WITH subduction) Volcanoes, Coastal Mountains, Island Arcs, and Oceanic Trenches

  13. Geological Formations – Transform Fault Faults and Earthquakes

  14. Let’s Find Some of These On a MAP… • Just by looking at a 3-D map you can determine what type of plate boundary there is b/c of the formations that occur!!!

  15. Let’s Review… • Convergent Subduction Zone occurs at the Peru-Chile Trench and Andes Mts. between the NAZCA and SOUTH AMERICAN PLATES. • Convergent (NO subd.) occurs at the Himalaya Mts. between the INDIAN and EURASIAN PLATES.

  16. Transform Fault occurs at the San Andreas Fault (in California!!!) between the NORTH AMERICAN and PACIFIC PLATES. • Divergent (Mid-Oceanic Ridge) occurs at the Mid-Atlantic Ridge between the NORTH AMERICAN and AFRICAN PLATES.

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