INSIDE EARTH

By Brooke E.

IntroductionEarthquakes are movements or vibrations in the Earth. They are

caused the release of stored energy in earth's outer layer.

There is also an instrument that detects, measures, and records

the energy of an earthquake.This is called a

seismograph, and it produces seismograms. Pressure within

the earth can cause rocks in its outer layer to break. These

breaks are called faults. When an earthquake begins, pressure deep within Earth causes rocks along faults to move and break.

As they move, energy is released as vibrations. These vibrations are called seismic

waves. As seismic waves move through Earth and along its

surface, they are felt as shakings and vibrations.

Primary Waves

Called P wavesFastest waves

First to arrive at a distant point

Travels through solids, liquids, and gases

Secondary Waves

Called S wavesSlower that P waves

Arrives later at a distant point

Travels through solids only

Surface Waves

Called L wavesSlowest waves of allFelt at the surface

Causes the most damage

The layers of the Earth!

Introducing...

CrustThinnest layer

Grass, dirt, and sandContains oxygen

Deeper under continents than oceans

Earth's most outer layerWe live on it

Solid rockThe thin yellow

layer is the crust

MantleThickest layer

Layer of rock lying below the crust

Allows tectonic plates to slowly move

Rocks move or flow due to pressure and high

temperatures

Outer coreMade of melted iron

Totally liquidInner core floats in this

layer

Inner core

Solid sphereCenter of the earth

Spins at a different rate than the rest of the

planet

Earthquake

Fault

Tectonic plates

Richter scale

Seismograph/Seismogram

CrustThe

yellow section

MantleThe red

layer

Outer coreThe yellow layer is the...

Inner coreThe layer that is the center of the earth