Chapter 4 Env/earth Science Vocabulary

Front 1

asthenosphere

Back 1

zone of mantle beneath the lithosphere that consists of slow flowing solid rock

Front 2

continental crust

Back 2

material that makes up landmasses

Front 3

continental drift

Back 3

hypothesis stating that the continents once formed a single landmass broke up and drifted to their present location

Front 4

convection

Back 4

transfer of heat through the movement of heated material

Front 5

convection current

Back 5

movement in a fluid caused by uneven heating

Front 6

convergent boundary

Back 6

border formed by the collision of two lithospheric plates

Front 7

divergent boundary

Back 7

boundary formed two lithosphere plates that are moving apart

Front 8

island arc

Back 8

chain of volanic islands formed along an ocean trench

Front 9

lithosphere

Back 9

thin outer shell of the earth consisting of the crust and the rigid upper upper mantle

Front 10

mid-alantic ridge

Back 10

undersea mountain range with a steep narrow valley along its center

Front 11

mid ocean ridge

Back 11

systems of under sea mountains range that wind around the earth

Front 12

ocean trench

Back 12

deep valley in the ocean floor that forms along a subduction zone

Front 13

oceanic crust

Back 13

material that makes up the ocean floor

Front 14

pangeea

Back 14

single landmass thought to have been the orgin contineat

Front 15

pantallasse

Back 15

giant ocean surrounded by pangeae

Front 16

plate tectonics

Back 16

theory that the lithosphere is made up of plates that float on the asthenosphere

Front 17

rift valley

Back 17

steep narrow valley formed as lithosphere plates seperate