1. Plates and Plate boundaries

2. Convergent plate boundaries
Can occur between two continental plates, a continental plate and an oceanic plate or between two oceanic plates.

3. Oceanic plate + Continental plate
One plate is pulled under another and something called a subduction zone is formed.
A trench is formed, magma builds up deep underground and a volcano is formed.

4. Oceanic plate + Oceanic plate
The same thing as above and an island arc is formed. This is a line of volcanoes in the ocean.

5. Convergent oceanic plates
ALEUTIAN ISLANDS
Convergent oceanic plates

6. http://news. nationalgeographic

7. Continental plate + Continental Plate
The plates collide and the rock is pushed up and forms mountains.

8. Divergent boundaries
Plates are moving away from each other. What happens in the space between them?

9. Oceanic plate + Oceanic plate
Seafloor spreading- A crack in the ocean floor forms. Magma oozes up and forms something called a mid- ocean ridge.

10. Continental plate + Continental plate
A rift forms (a gap). A valley forms and mountains may form on the outside.
In the gap the streams and rivers form in the gap.
A new tectonic plate may form if they completely break away.

11. Transform boundaries Tectonic plates grind past each other.
This causes a fault- crack in the earths crust e.g. San Andreas.
Earthquakes are common.

12. San Andreas

13. http://news. nationalgeographic