Earth Structure And Processes 1

Front 1

Crust

Back 1

Outermost layer of earth.

Front 2

lithosphere

Back 2

crust and top of mantle

Front 3

Mantle

Back 3

Middle and thickest layer of earth density increases with depth because of increasing pressure

Front 4

core

Back 4

Inner layer heaviest most dense.

Front 5

Inner core

Back 5

solid most dense part of earth

Front 6

theory of Plate tectonics

Back 6

Explains how large sections of Earth's crust (lithospheric plates) move and how many of earth's features form.

Front 7

Continental drift

Back 7

hypothesis based on continent shape, fossil evidence, rocks, and climate clues led to the theory of plate tectonics

Front 8

lithospheric plates

Back 8

float on the upper part of the mantle

Front 9

convection currents

Back 9

cause the asthenosphere to flow slowly carrying with it the plates of the lithosphere

Front 10

Divergent boundaries

Back 10

two plates moving apart

Front 11

sea-floor spreading (ocean) or rift valley (land)

Back 11

occurs along divergent boundaries as magma pushes up and hardens between separating plates forming new crust.

Front 12

convergent boundary

Back 12

two plates come together and collide activity depends on the type of crust colliding

(deep sea trench or Mountains on land)

Front 13

Subduction zone

Back 13

convergent boundary where more dense oceanic plate slides under less dense continental plate or another oceanic plate

(deep sea trench)

Front 14

transform boundary

Back 14

two plates slide past each other crust is neither created or destroyed earthquakes frequent here.

Front 15

Pangaea

Back 15

continents all joined together one large land mass. Plates then moved split apart, oceans formed, continents formed. Plates continue to move one to ten centimeters a year.