Movements of the Earth And the results they cause

Plate Movements Plates can move in three ways. Apart Together Past each other

Joe can you demonstrate for us? Not that kind of plate Joe!

Plates Moving Apart What does that cause?

Write It! Divergent boundary – when plates move apart forming a rift valley or a ridge.

Good question Joe! It forms the ridges in the ocean like this one the Mid-Atlantic Ridge. The plates pull apart and new land is created as it bubbles up from the mantle creating a ridge.

The Great Rift Valley As plates move apart they can also cause a valley like the Great Rift Valley in Africa.

Ok Joe how about plates moving together? Not quite Joe!

Plates pushing together what do they cause? When plates of the same density collide the buckle and form mountains. If one plate is less dense than another subduction occurs. One plate slides under the other and volcanoes or mountains are formed.

Write It! Divergent boundary – when plates move apart forming a rift valley or a ridge. Convergent boundary – when plates move together forming mountains or volcanoes.

One more chance Joe plates moving past each other. Joe that is just wrong!

Plates that Move past each other and what they cause. Where plates slide past each other transform boundaries occur. They create faults and when they move they cause a great deal of damage in the form of earthquakes.

Faults The fault you are most familiar with is the San Andreas Fault in California. There have been several earthquakes in California that have caused major damage.

Earthquake damage.

Write It! Divergent boundary – when plates move apart forming a rift valley or a ridge. Convergent boundary – when plates move together forming mountains or volcanoes. Transform boundary – when plates move past each other causing earthquakes.

Lithospheric Plates The crust of the Earth is broken into many pieces called plates. The plates "float" on the soft, semi-rigid asthenosphere.

Well that is the end of this lesson time to check for understanding! When one plate pushes against another it causes uplift. This uplift will likely result in a A.Rift B.Mountain C.Ridge D.Valley

Well that is the end of this lesson time to check for understanding! What causes the earthquake activity in California? A.High Tides B.Low Tides C.Plate Movement D.Volcanic Activity

Well that is the end of this lesson time to check for understanding! What caused the damage seen in the picture? A.Soil Erosion B.Heavy Rains C.Horizontal Movement of the Earth’s crust D.Volcanic eruption

Well that is the end of this lesson time to check for understanding! Plates pushing together cause A.Earthquakes. B.Rift Valleys. C.Mountains. D.Rivers.