plate tectonics & continental drift
by: nathalie lara
After they found out it was true they began to fined out more things about the earth, like plate tectonics. Plate tectonics are ways that the crust is in a slow constant movement.
The types of plate tectonics
There are 3 types of convergent plate boundaries.
Convergent- ocean to ocean is when 2 plates come together and crust is destroyed. The density of the plates determine which will sink. an example of that would be the Aleutians island in Japan.
convergent - ocean to continent is when ocean sinks under continent. These usually creat coastal volcanic mountain ranges. An example of this would be The cascades mountain ranges in Washington state.
The last type of convergent boundary is:
convergent- continent to continent is when 2 continents meet and fold together to creat mountains. In this process crust is neither created or destroyed. An example of this would be the Himalayas mountains in Asia.