Inside Earth

By Lisa

Shekhter

Introduction

• Earthquakes are movements or vibrations in earth

• They are caused by the real ease of stored energy in Earth's outer layer

• This realse of energy causes sudden shift of rock as well as other kinds of changes

• Scientists feel and listen to earth by using instruments called seismograph

• A seismograph detects, measures, and records the energy of earthquakes vibration

• Pressure within earth can cause rocks in its outer layer to brake move,the brake is called a fault.

Primary Waves

• Called P waves

• Fastest waves

• First to arrive at a distance point

• Travels through solids, liquids, gases

Secondary Waves

• Called S waves

• Slower than P waves

• Arrive later at a distance point

• Travel through solids only

Surface Waves

• Also called L waves

• Slowest waves of all

• Felt at the surface cause the most damage

Crust

• Solid rock that makes up Earth's outer layer.

• It's deeper under continents than under oceans.

Mantle

• Layer of rock lying below the crust

• Rocks in the region can move or slowly move or slowly flow because of great pressure and high temperatures

Outer core

• Liquid layer below the mantle

• It is made out of melted iron

Inner core

• A sphere of solid materials at Earth's center

GUESS THAT PICTURE ?

Fault

Tectonic plates

Seismograph

Earthquake