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Ch 7 Earth's Moving Crust

Published on Nov 18, 2015

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PRESENTATION OUTLINE

Ch 7 Earth's Moving Crust

By: Rhian Gorman
Photo by gnuckx

Crust

Earth's solid, rocky, surface
Photo by Ken Lund

Original Horizontality

the idea that many rocks form flat

Continental drift

the idea that about a supercontinent
Photo by Tim Evanson

Sea-Floor Spreading

the idea that new crust  is forming at ridges in the sea floor
Photo by wockerjabby

Magma

hot, molten rock below the Earths crust
Photo by [Danny_21]

Plate Tectonics

Earths surface is broken up into plates

Mantle

the layer beneath Earths surface
Photo by Scot Nelson

Subduction

a denser ocean plate under another plate when they collide
Photo by Ken Lund

Fault

huge crack in earth's crust
Photo by dsearls

Focus

the point where an earthquake starts
Photo by Genista

Seismic Waves

a vibration that spreads out away from a focus when an earthquake happens
Photo by tobo

Epicenter

the center of an earthquake right above the focus
Photo by quapan

Aftershock

the movement after an earthquake

Seismograph

a device that measures earthquakes
Photo by matthileo

Magnitude

the amount of energy released by a volcano
Photo by gnuckx

Vent

the central opening in a volcano where magma can escape
Photo by Marion Doss

Lava

magma that reaches earth's surface
Photo by gnuckx

Crater

a cuplike hollow that forms on top the volcano around the vent

Hot Spot

where magma can melt through a plate above it

Cinder-Cone Volcano

a steep side volcano that erupts particles to boulders

Shield Volcano

a wide gently sloped volcano
Photo by kahunapulej

Composite Volcano

a cone formed volcano

Geothermal Energy

heat from below earth's surface