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Discovering Earth's Interior
Transcript of Discovering Earth's Interior
Scientists use seismic waves to learn about the Earth's Interior
Seismologists measure changes in the speed and direction of seismic waves the penetrate the interior of the planet.
The Composition of the Earth
Scientists divide the Earth into three layers:
The Structure of the Earth
-is the solid, outer layer of the Earth that consists of the crust and the rigid upper part of the mantle.
Seismic waves are the same waves that travel through the Earth's interior during an earthquake
Ex.) When you tap a Melon to see if its ripe
A seismic wave is altered by nature of the material through which it travels
-They learned that the Earth is made up of different layers and have inferred what substances that make up each layer.
These layers become progressively denser
is the layer of rock between the crust and the core
is the central part of the Earth below the mantle.
- the solid, plastic layer of the mantle below the lithosphere.
-Made of mantle rock that flows slowly, allows tectonic plates to move
The Earth's outer core is a dense liquid layer
The inner and outer core make up about 1/3 the Earth's mass
By Luis Ong
outermost layer of the Earth
-The thinnest layer
-Makes up less than 1 percent of the Earth's mass
-5 to 8 kilometers thick beneath the oceans
-20 to 70 kilometers thick beneath the continents.
is the layer of rock between the crust and core
-Made up of rocks of medium density
-Makes up about 64 percent of the Earth's mass
part of the Earth below the mantle.
-Composed of the densest elements
solid inner cor
liquid outer core