Welcome to Class What is Pangea?

Agenda Review Pangea/continental Drift Erosion Create a class dictionary

Review Continental Drift - continents formed a single landmass, broke up, and drifted to their present location 3 lines of evidence –Fossil –Rock –Climate

Plate Tectonics plate tectonics - large pieces of the lithosphere, plates, move and change shape –15 major plates Continents AND Oceans are on the plates

How Plates Move Convection –Hot rises and cool sinks –Hot material rises through the asthenosphere and helps move the plates

Pangea Giant Continent 250 million years ago –End of the Permian – mass extinction Broke up into 2 continents –Gondwanaland - Africa, S. America, India, Australia, and Antarctica –Laurasia - North America and Eurasia Slowly moved to where they are today

Future 50 million years

Future million years

Future Million Years

Water Cycle Revisited

Question Explain evaporation, precipitation, and condensation

Water Important –We need it It can destroy

Erosion vs. Weathering Erosion –Breakdown AND movement Weathering –Breakdown of material

Two Types of Weathering Mechanical – break down by physical means –Abrasion –Organic activity Chemical – break down by chemical reactions –oxidation

Rates of Weathering Some material erode faster –Soft vs. hard How much is area exposed Location –Climate –Topography/Elevation

Wind Erosion Wind can also erode Moves loose fragments of dirt/dust –Areas where plant roots do not anchor soil as well

EROSION Creates many features Class dictionary