PHYSICAL

GEOGRAPHY

LAYERS OF THE EARTH

CORE

MANTLE

CRUST

Earth has 4 major outer

layers: atmosphere (air),

biosphere (living

things), hydrosphere

(water), lithosphere

(land)

Alfred Wagner

Continental Drift

Theory

Pangaea …

supercontinent

PLATE TECTONICS

Geologists developed

the theory … based on

plates and the Earth’s

heat and energy

CONVECTION

Where in the US?

4 Types of Plate

Movements

Subduction

Convergence

Split Apart

Slide-by

SUBDUCTION

CONVERGENCE

SPLIT APART

SLIDE BY

PLATE MOVEMENTS

Create …

“Ring of Fire”

Plate Tectonics – the earth is divided into plates, which are in motion. Earthquakes

and volcanoes often occur along plate boundaries.

Pacific Ring of Fire

Compare locations of volcanoes and earthquakes to plate boundaries.

External Factors on

Landscapes

Weathering

Erosion

Weathering

Chemical

Physical

CHEMICAL WEATHERING

PHYSICAL WEATHERING

Erosion

Water

Wind

Ice

WATER EROSION

WIND EROSION

WIND EROSION

Ice Erosion