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Plate Tectonics By Mason Archibald Pd. 5 By Mason Archibald Pd. 5.

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Presentation on theme: "Plate Tectonics By Mason Archibald Pd. 5 By Mason Archibald Pd. 5."— Presentation transcript:

1 Plate Tectonics By Mason Archibald Pd. 5 By Mason Archibald Pd. 5

2 Convection Currents  Convection currents are heat cycles caused by the core. They spin around in circles and tug and push at the plates.

3 Ocean to Ocean Convergent Boundaries  At convergent boundaries, tectonic plates move toward each other. When the oceanic plates push against each other, it is called ocean to ocean convergent boundaries. At these boundaries, plates push against each other and cause one plate to move underneath the other and be recycled into the mantle. One example of this is the Aleutian Islands in Alaska.

4 Example

5 Ocean to Continent Convergent Boundaries  When continental and oceanic plates crash together, the oceanic plate is pushed under by the continental plate. The oceanic plate is sucked down slowly into the mantle in a process known as "subduction".  An example of this is the Juan De Fuca and North-American Plate.  When continental and oceanic plates crash together, the oceanic plate is pushed under by the continental plate. The oceanic plate is sucked down slowly into the mantle in a process known as "subduction".  An example of this is the Juan De Fuca and North-American Plate.

6 Example

7 Continent to Continent Convergent Boundaries  When Continent plates collide, they can’t be subducted. The Continental crust is too light. Therefore, both of the plates have to be pushed upward. This causes mountains and volcanoes to form.

8 Divergent Boundaries  Divergent Boundaries are plates that pull away from each other. Most of them are located in the middle of the ocean, where Pangaea was formed. They are usually higher than the rest of the seafloor around them, and a huge valley is in the middle.

9 Transform Boundaries  At Transform Boundaries, plates slide past each other. They slide past each other very quickly, and major earthquakes usually happen. Volcanoes never form at transform boundaries.

10 Hot Spots  A Hot Spot is a place where volcanoes erupt frequently. An example of hot spots are the Hawaiian Islands. The seafloor moves about five inches a year, and the hot spot erupts underneath it, causing underwater mountains and more volcanoes.

11 Convergent Boundaries + Geosphere  Convergent boundaries affect the geosphere by molding and twisting the continental crust.

12 Divergent Boundaries + Geosphere  Divergent boundaries affect the geosphere by pulling and tugging the crust apart.

13 Transform Boundaries + Geosphere  Transform boundaries affect the geosphere by tearing land apart and “scooting” it.

14 Hot Spots + Geosphere  Hot Spots affect the geosphere by pushing up the land from underneath and shooting up magma.

15 Convergent Boundaries + Biosphere  Convergent boundaries affect the biosphere by causing earthquakes that destroy homes and kill people.

16 Divergent Boundaries + Biosphere  Divergent boundaries affect the biosphere by pulling apart the crust. People and other things can fall through the cracks.

17 Transform Boundaries + Biosphere  Transform boundaries can affect the biosphere by causing mass earthquakes that cause mass destruction.

18 Hot Spots + Biosphere  Volcanic eruptions at hot spots can cause mass destruction. Pyroclastic flow can kill many people and destroy everything in it’s path.

19 Convergent Boundaries + Atmosphere  Convergent boundaries can harm the atmosphere by volcanic eruptions. The projectiles from the eruption can pollute the air. The same with divergent boundaries and hot spots.

20 Transform Boundaries + Atmosphere  Volcanic eruptions cannot happen at transform boundaries, only earthquakes. Therefore the projectiles from volcanoes can’t pollute the air. However, dust and debris from buildings can.

21 Convergent Boundaries + Hydrosphere  Convergent boundaries can affect the hydrosphere by volcanic eruptions. The eruptions can build up and form new islands on the surface, but the volcanic ash can also pollute the water and harm underwater life. This also happens with hot spots.  Convergent boundaries can affect the hydrosphere by volcanic eruptions. The eruptions can build up and form new islands on the surface, but the volcanic ash can also pollute the water and harm underwater life. This also happens with hot spots.

22 Divergent Boundaries + Hydrosphere  Divergent boundaries can affect the hydrosphere by pulling the ocean floor apart and making trenches.

23 Transform Boundaries + Hydrosphere  Transform boundaries can affect the hydrosphere by moving the ocean floor sideways a little.

24 The End! By Mason Archibald pd. 5

25 Sources           750.jpg 750.jpg    g g      jpg jpg  +Pics jpg +Pics jpg           750.jpg 750.jpg    g g      jpg jpg  +Pics jpg +Pics jpg

26 More Sources  if if  als/images/seafloor_spreading.gif als/images/seafloor_spreading.gif  if if  als/images/seafloor_spreading.gif als/images/seafloor_spreading.gif


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