L4 CONTINENTAL DRIFT THEORY

Continental drift theory

The THEORY that earth's continents were once joined as a single supercontinent.

Pangaea

Protoland and Supercontinent

Pan all

gaea land

Meaning of PANGAEA

Pan all

thalasa sea

Meaning of PANTHALASA

Laurasia

North

Gondwanaland

South

300 million years ago

Scientist believe pangaea BROKE APART BLANK at the earth's plate move.

Fit of the continents

evidence from fossils

climate evidence

mountain ranges

4 EVIDENCES

Fit of the continents

Wegener noted how the coastals or continents particularly south america and africa, seemed to fit together like pieces of a PUZZLE.

Evidence from fossils

The discovery of fossils of the same continent plants and animals (like the LYSTROSAURUS AND GLOSSOPTERIS) on widely separated continents suggest this landnesses were once connected.

Lystrosaurus

Animal

Glossopteris

Plants

Climate evidence

Evidence past climates, seem as GLACIAL GROOVES were found in area that are currently tropical or and like part of africa, implying these areas where once located.

Mountain ranges

Wegener believed that MOUNTAINS were one mountain range that has been split apart by the drifting continents.

Pole fleeing forces

Explain the movement of continents

Alfred wegener

Create the CONTINENTAL DRIFT THEORY

Arthur holmes

Discover the CONVECTION CURRENT

Divergent

convergent

transform

3 PLATE BOUNDARIES

Divergent boundaries

Two plates pull AWAY from each other

Convergent boundaries

Two or more plates move TOWARDS each other and collide

Subduction zone - volcanoes

continental collision - mountains

2 types of CONVERGENT

Transform

Slide horizontally PAST EACH OTHER