Continental Drift and Pangea
Continental drift is the movement of the continents. This theory was invented by Alfred Wegener in 1915. Alot of evidence is here to prove one being Pangea. Pangea was a super continent that had all the continents put together in one. We know this is true because the continents fit together like puzzle pieces. More prove of Pangea is that similar fossils have been found on the coast of South American and Africa. Sea floor spreading is also proof of continental drift!
Proof of continetal Drift
They fit together and similar fossils have been found
This was a super continent that spread apart over millions and millions of years
If continental drift continues this could be a possibility in the future!
The earth has three main layers the crust, the mantle, and the core. The crust has to layers the inner and outer crust. The crust is were the earths terrain is. The Mantle is made of semi molten rock called magma and it is bellow the crust.Above the mantle are the Plates. The core is a ball and is made mostly of nickle and iron. The plates move because of the convection currents generated in the core.
Plate Tectonics, Plate boundary types, and plate movement
Plate Tectonics is the theory that earth is divided into several plates. There are 12 main plates shown in the picture below. Plates have many different types of boundaries. The boundaries are divergent, convergent subduction, convergent collision, and transform.
These are the 12 main plates
The radioactive decay in the mantle make the plates move.
- A transform boundary is when two plates move against each other. This can form earthquakes and fault lines
- Continental subduction is when a oceanic plate and a continental plate is formed. This can form trenches and volcanoes
- Continental collision is when two continental plates hit and form mountains
- Divergent is when two plates separate. This forms rift valleys
Ring of Fire
This is were the a large number of earthquakes and volcanoes happen because of boundaries like transform and continental subduction