Key Question 3: The ‘Big’ Ideas in Geology Idea One- The Rock Cycle Idea Two- Plate Tectonics Idea Three- Global sea/ temperature changes

Key Question 3: The ‘Big’ Ideas in Geology Idea One- The Rock Cycle Idea Two- Plate Tectonics Idea Three- Global sea/ temperature changes

Plate Tectonics Key Question: How does the structure of the Earth allow plate tectonics? Key Words: Lithosphere Asthenosphere Mantle Core Plate Boundaries HW: Find out how Alfred Wegner realised the continents had moved.

1 minute to come up with an answer….. To Start….. What has an egg got to do with Earth Structure? In Pairs 1 minute to come up with an answer…..

Why is earth like an egg (analogy)? Core 1. What is the state of each? Crust 2. What is the composition of each? Mantle

Now complete this table Egg Analogy is…. Good at showing Bad at showing The thickness of the crust relative to its surface area The relative size of the 3 main (compositional) layers The state of the core The state of the mantle The state of the crust Extension: Is there anything this model does not show?

Earth Structure

Earth Structure CONTINENTAL CRUST OCEANIC CRUST Continental crust -“Granitic” Oceanic crust - “Basaltic” CRUST CRUST Peridotite (olivine & augite) MANTLE MANTLE Iron & Nickel CORE CORE This is a compositional layering of the Earth i.e. by what material the layers are made of.

Earth Structure CRUST solid (cool, brittle & rocky) LITHOSPHERE partially molten (only 1-5% molten) ASTHENOSPHERE MANTLE MESOSPHERE solid (solid-state convection) liquid OUTER CORE CORE INNER CORE solid This is a mechanical layering of the Earth i.e. by what properties the layers have.

Earth Structure Crust Mantle Core Compositional

Compositional Mechanical Crust Lithosphere Asthenosphere Mantle Earth Structure Crust Lithosphere Asthenosphere Mantle Mesosphere Outer Core Core Inner Core Compositional Mechanical

LITHOSPHERE ASTHENOSPHERE Characteristics of Plates CONTINENTAL CRUST OCEANIC CRUST UPPER MANTLE SEMI-SOLID (MOBILE) ASTHENOSPHERE MANTLE

LITHOSPHERE ASTHENOSPHERE Characteristics of Plates CONTINENTAL CRUST OCEANIC CRUST LITHOSPHERE OCEANIC CRUST UPPER MANTLE UPPER MANTLE SEMI-SOLID (MOBILE) SEMI-SOLID (MOBILE) ASTHENOSPHERE MANTLE MANTLE

Continental Plate Oceanic Plate PLATES Characteristics of Plates Continental Plate Oceanic Plate CONTINENTAL CRUST PLATES OCEANIC CRUST UPPER MANTLE OCEANIC CRUST UPPER MANTLE SEMI-SOLID (MOBILE) SEMI-SOLID (MOBILE) ASTHENOSPHERE MANTLE MANTLE

Cut out your tectonic map rearrange it and stick it in your book?