1. Earth on the Move Earth Structure & Plate Tectonics Notes

2. Baker 7th grade science 2003- 2004 Core i) Deep within the Earth is the core ii) The core is made mostly of nickel & iron iii) Twice as dense as the mantle. Main source of heat that triggers the convection currents

3. Baker 7th grade science 2003- 2004 The core is made of two layers (1) Outer core: molten (liquid) nickel and iron Inner core: solid nickel and iron –Densest layer of the earth

4. Baker 7th grade science 2003- 2004 Mantle Full of very hot rock that flows Where magma is located Thickest layer/ 60- 75% Most of the earth’s mass 80%

5. Baker 7th grade science 2003- 2004 Mantle 3 Parts of the Mantle –Mesosphere –Asthenosphere –Lithosphere

6. Baker 7th grade science 2003- 2004 Mesosphere Strong lower part of mantle Between outer core and asthenosphere

7. Baker 7th grade science 2003- 2004 Asthenosphere Hot, weak zone directly under the lithosphere Flows at a very slow rate Has convection currents that moves tectonic plates

8. Baker 7th grade science 2003- 2004 Lithoshpere Thin, uppermost part of the mantle; cooler & less rigid Floats on the athenosphere, and slides around very slowly. (iii) The upper part of the lithosphere melts rocks, forming a substance called magma.

9. Baker 7th grade science 2003- 2004 In Mantle Convection Current: process by which hot fluid or rock rises to the surface and cool rock sinks.

10. Baker 7th grade science 2003- 2004 Crust outermost thinnest layer of the Earth. 2 types of crust –Oceanic – made of basalt – more dense –Continental – made of granite – less dense

11. Baker 7th grade science 2003- 2004 Lithosphere Thinnest physical layer Floats on the asthenosphere

12. Baker 7th grade science 2003- 2004 Seismic Waves The speed tells us about the earth’s interior –How thick –How dense –Solid or liquid

13. Baker 7th grade science 2003- 2004 Earth, Inside & Out 3 Compositional Layers 1. Crust 2. Mantle 3. Core 5 Physical Layers 1. Lithosphere 2. Asthenosphere 3. Mesosphere 4. Outer Core 5. Inner Core

14. Baker 7th grade science 2003- 2004 Inner Core Composition –iron + nickel Thickness –1,230 km State of Matter –solid

15. Baker 7th grade science 2003- 2004 Outer Core Composition –iron + nickel Thickness –2,200 km State of Matter –liquid

16. Baker 7th grade science 2003- 2004 Mantle Composition –Silicon, magnesium, aluminum Thickness –2,900 km State of Matter –Plasma

17. Baker 7th grade science 2003- 2004 Crust Composition –Oxygen, silicon, aluminum Thickness –5-100 km State of Matter –solid