Structure of the Earth&

Plate Tectonics

Our Changing Earth

The surface of the earth is always changing.

What are the two ways in which landform change on the surface?

Weathering Erosion

The landform also change due to the movement ofthe plates.

Internal Structure of the Earth

The internal structures

of the earth are Inner core Outer core Mantle Crust

Crust

Which structure of

the earth do we live

on? Crust

The crust is made of

pieces called plates, and it is not hot.

Crust

The crust has cracks, and these cracks are known as faults.

Crust

Each separate part of the crust is called a plate – a tectonic plate.

Mantle

These plates float on a layer of liquid rock called the mantle.

The plates move around slowly on top of the mantle.

Inner and Outer Core

The center of the earth is a metal core and it is broken into two parts, the inner and the outer core.

Depth and Temperature

Structure of the Earth

Depth Temperature

Mantle 2900 Km 870°C

Outer core 5150 Km 4400-6100°C

Inner core 6400 Km 7000°C

Plate Tectonics

Earth’s crust are broken into enormous slabs called tectonic plates.

About 200 million years ago, a giant landmass existed called pangaea.

Pangea Movement

http://www.geo.wvu.edu/~donovan/geol101/animations/47.swf

http://www.classzone.com/books/earth_science/terc/content/visualizations/es0806/es0806page01.cfm?chapter_no=visualization

Plate tectonics

Slow movement of liquid rock in the mantle causes the tectonic plates to move.

http://education.sdsc.edu/optiputer/flash/convection.htm

Plate Tectonics

Tectonic Plates and Earth’s Active volcanoes

Where are most of the volcanoes

located?

What is a Volcano?

Volcano is an opening or a vent in the surface of the earth through which magma and gases escape.

Magma is molten rock located beneath the surface of the earth.

Volcano Erupting

Earthquakes

http://www.classzone.com/books/earth_science/terc/content/visualizations/es1002/es1002page01.cfm?chapter_no=visualization

http://www.pbs.org/wnet/savageearth/animations/earthquakes/index.html

Earthquakes

What causes earthquake? When plates rub together along their faults

lines (the places where they meet). Most earthquakes begin deep within the

Earth’s surface.

http://news.bbc.co.uk/2/hi/science/nature/4126809.stm

Earthquakes

The amount of energy released by an earthquake is called its magnitude.

When an earthquake occurs at the sea floor, it is called tsunami.

http://news.bbc.co.uk/2/hi/asia-pacific/5194316.stm

Resources

http://csep10.phys.utk.edu/astr161/lect/earth/tectonics.htmlhttp://www.stvincent.ac.uk/Resources/EarthSci/Tectonics/move.htmlhttp://geobytesgcse.blogspot.com/2007/01/plates-and-convection-currents.htmlhttp://www.globalchange.umich.edu/globalchange1/current/lectures/evolving_earth/evolving_earth.htmlhttp://www.mrsciguy.com/eq.html