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Plate Tectonics Presentation
Transcript of Plate Tectonics Presentation
What are plate tectonics?
Tectonic plates are the structures of Earths crust. It is divided into seven and eight major plates and many minor plates. They are made up of large portions of solid rocks.
Continental Drift (Theories)
Plate tectonic theory started in 1912 when Alfred Wegener proposed his theory of ‘continental drift’. He was the first to notice that the earth’s surface had changed through time.
Plate tectonics was once made up of a single continent through the geological time. The continent eventually separated and drifted apart; forming into the seven or eight continents we have today. Plate tectonics is the outer layer of earth – lithosphere that moves around the earth’s surface.
Here is a short video that shows how the continents have drifted through time.
Movements of Plate Tectonics
Plate Tectonics travel a few centimeters a year. The plates can move in many directions, this is controlled by the convection currents beneath the plates. When these plates collide it causes intense geologic activity such as...
Earthquakes are formed when rocks break and slide quickly against each other, causing fault lines. Energy is then released in travel waves called seismic waves and cause the shaking we feel during an earthquake.
Most volcanoes are formed by tectonic plates. Sometimes a plate will sink into the mantle and it will melt. When the molten rock makes it to the surface lava is formed. As the lava builds up, a volcano is formed.
There is two types of mountains that are formed by plate tectonics. They are the fold mountains and fault mountains. Fold Mountains are formed by the collision of two plates causing folding of the earth’s crust. Fault Mountains are formed when rock materials slide along the fault in the earth’s crust.
The Layers in Earth
In the Earth the layers consist of...
The Earth's Crust
By Lydia Lai and Wendy Truong
The Earths Crust is a thin layer of rock. It contains rock and loose materials. It is 8 kilometers thick. The Earth’s crust is broken into many pieces called plate tectonics.
The Mantle is made up of a thick solid rocky substance. The first 50 miles contain very hard rock. The other 150 miles are heated solid rocks.
The upper mantle is made up of many substances. It largest layer of the Earth. The mantle is composed of very hot, thick rock - 1600 degrees Fahrenheit.
The Outer Core consists of very hot metals. The temperature varies from 4000 to 9000 degrees Fahrenheit. All the metals in the outer core are in liquid state.
The inner core is the hottest part of the earth. The inner core of the Earth begins about 4000 miles beneath the earth’s crust and is about 800 miles thick.
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These Plates include...
The temperature varies around..