Earth Science Unit 3 #2

Front 1

Continental Drift

Back 1

A theory stating that Earth's continents have been joined together and have moved away from each other @ different times in the Earth's history.

Front 2

Convection Currents

Back 2

Movement in a fluid cause by uneven heating.

Front 3

Convergent Boundary

Back 3

Border formed by the collision of 2 lithospheric plates.

Front 4

Divergent Boundary

Back 4

Border formed by two lithospheric plates moving apart.

Front 5

Earthquake

Back 5

Vibration of earth's crust.

Front 6

Fault

Back 6

Break in rock along which rocks on either side of the break move.

Front 7

Folding

Back 7

Permanent deformation or bending of a rock under stress.

Front 8

Hot spots

Back 8

Area of volcanism within a lithospheric plate.

Front 9

Island Arcs

Back 9

Chain of volcanic islands formed along an ocean trench.

Front 10

Mountain

Back 10

A massive + steep sided, raised portion of the earth's surface formed through volcanic activity ,erosion, or collision of 2 tectonic plates.

Front 11

Paleomagnitism

Back 11

Earth's record of magnetism in rocks.

Front 12

Plate tectonics

Back 12

Theory that the lithosphere is made up of plates that float on the asthenosphere and that the plates possibly are moved by convection currents.

Front 13

Rift Valleys

Back 13

Steep, narrow valley formed as lithospheric plates separate.

Front 14

Sea floor spreading

Back 14

Movement of the ocean floor away from either side of a mid ocean ridge.

Front 15

Subduction Zone

Back 15

Region where 1 lithospheric plate moves under another.

Front 16

Transformation boundary

Back 16

boundary formed where 2 lithospheric plates slide past each other.

Front 17

Trenches

Back 17

Deep valley in the ocean floor.

Front 18

Tsunamis

Back 18

Great ocean wave that often occurs after a major earthquake with an epicenter on the ocean floor.

Front 19

Volcano

Back 19

An opening, or rupture, in a planets surface or crust, which allows hot magma, ash, and gases to escape from below the surface.

Front 20

Weathering

Back 20

Change in physical form or chemical composition of rock materials exposed at Earth's surface.