The Physical World

Chapter 2

Our Solar System

• Sun Planets– Strong gravitational pull of Sun keeps planets in

orbit• Terrestrial Planets / Gas Giant Planets– Mini Solar Systems (GGP’s)

• Thousands of Smaller Objects in Space – Asteroids, Comets, Meteoroids• Siberia 1908

Getting to Know Earth

• 70 Percent is Water– Hydrosphere / Lithosphere – Atmosphere / Biosphere

• Landforms – RA2-RA3– Chimborazo!

Forces of Change

• Layered Planet– IC – solid, super hot– OC – liquid, melted iron and nickel– Mantle – dense, thick and hot rock– Crust - rocky shell – broken into plates

• Plate Movement – Continental Drift – No one really knows what causes CD

Internal Forces

• Colliding and Spreading Plates– Subduction, Accretion and Spreading– Folds and Faults– Earthquakes / Ring of Fire– Volcanic Eruptions / Volcanoes 101

External Forces

• Weathering – Physical – Chemical

• Erosion– Wind– Glacial– Water