Plate Tectonics

Paleontologists noticed that these were the same on different continents even though the continents were separated by oceans.

Fossils

Scientist who first proposed that thermal convection in the mantle causes continental drift.

Holmes

The zone below the the lithosphere it is more 'plastic' than the lithosphere so it is easier to bend and move.

Asthenosphere

The most outer solid portion of the planet Earth.

Crust

The theory of Continental ______.

Drift

The outer part of the Earth's crust. Is it composed of solid rock.

Lithosphere

The Earth's ________ field reverses from time to time.

Magnetic

Section of the Earth below the crust.

Mantle

Places where new sea floor is being created.

Mid ocean ridge

Alfred Wegner noticed that the continents all for together like a puzzle. This is called ________.

Pangaea

Source of heat in the mantle.

Radioactivity

Sea floor _______.

Spreading

Places where the sea floor is forced under continental plates. ____ zones.

Subduction

Plate _______.

Tectonics

The primary force that causes the sea floor to spread and continents to drift.

Thermal convection

The deepest parts of the oceans.

Trenches

Scientist who first proposed the theory of continental drift.

Wegner