plate tectonics and continental drift
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The basics of continental drift. You have to understand and be able to explain everything in this slideshow. you should copy down the recap at the end.TRANSCRIPT
Plate Tectonics and Continental Drift
All you need to know
The Earth’s crust is divided into large Plates.
Tectonic Plates
The Earth’s crust is divided into large Plates. These Plates are called tectonic Plates.
Tectonic Plates
The Earth’s crust is divided into large Plates. These Plates are called tectonic Plates. They Look like this:
Tectonic Plates
Continents are basically what we see of the tectonic plates above water.
Continents
Continents are basically what we see of the tectonic plates above water.
We can see continents once were joined together.
Continents
Continents are basically what we see of the tectonic plates above water.
We can see continents once were joined together.
But the movement of the tectonic plates has pulled them apart over millions of years.
Continents
How the continents used to look
Continental drift is the thought that the continents are moving or drifting apart and together.
Continental Drift
Continental drift is the thought that the continents are moving or drifting apart and together.
There is evidence that shows us the continents were once together.
Continental Drift
Some evidence of continental drift is;
Continental Drift
Some evidence of continental drift is;◦ There is evidence there used to be a glacier (river
of ice) in the Sahara dessert.
Continental Drift
Some evidence of continental drift is;◦ There is evidence there used to be a glacier (river
of ice) in the Sahara dessert.◦ There are fossils of the same creatures found on
different continents.
Continental Drift
Some evidence of continental drift is;◦ There is evidence there used to be a glacier (river
of ice) in the Sahara dessert.◦ There are fossils of the same creatures found on
different continents.◦ The Edges of the continents fit together like a
jigsaw puzzle
Continental Drift
Some evidence of continental drift is;◦ There is evidence there used to be a glacier (river
of ice) in the Sahara dessert.◦ There are fossils of the same creatures found on
different continents.◦ The Edges of the continents fit together like a
jigsaw puzzle◦ Coal can be found in Antarctica (you need plants
to make coal but right now there are no plants in Antarctica).
Continental Drift
Continental Drift is caused by currents in the mantle.
Continental Drift
Continental Drift is caused by currents in the mantle.
The Magma in the mantle closest to the core heats up and becomes lighter.
Continental Drift
Magma closest to the core heats up
Continental Drift is caused by currents in the mantle.
The Magma in the mantle closest to the core heats up and becomes lighter.
Because it is light it floats to the top.
Continental Drift
Hot Magma Floats to the top
Once the hot magma is at the top it begins to cool.
Continental Drift
Once at the top theMagma cools
Once the hot magma is at the top it begins to cool.
The cooler magma sinks down again because it is heavier.
Continental Drift
The cool magma sinksBack towards the core
Once the hot magma is at the top it begins to cool.
The cooler magma sinks down again because it is heavier.
This creates A circular current that pushes the tectonic plates and continents towards and away from each other.
Continental Drift
Plates move away and towards each other
Circular current
Plates that are pushed together are called converging plates.
Continental Drift
Converging Plates
Plates that are pushed together are called converging plates.
Plates That are pushed apart are called diverging plates
Continental Drift
Diverging Plates
Plates that are pushed together are called converging plates.
Plates That are pushed apart are called diverging plates
Plate that are pushed sideways past each other are called transverse plates
Continental Drift
Transverse Plates
The earth’s crush is on giant tectonic plates. The land above the water of the plates are divided into continents.
Recap
The earth’s crush is on giant tectonic plates. The land above the water of the plates are divided into continents.
The Plates move because of currents in the Mantle
Recap
The earth’s crush is on giant tectonic plates. The land above the water of the plates are divided into continents.
The Plates move because of currents in the Mantle
Converging, Diverging and transverse are the three kinds of plate boundaries.
Recap