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Baker 7th grade science 2003- 2004 Earth on the Move Earth Structure & Plate Tectonics Notes.

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Presentation on theme: "Baker 7th grade science 2003- 2004 Earth on the Move Earth Structure & Plate Tectonics Notes."— Presentation transcript:

1 Baker 7th grade science 2003- 2004 Earth on the Move Earth Structure & Plate Tectonics Notes

2 Baker 7th grade science 2003- 2004 Earth, Inside & Out The Earth is divided into three layers 1. Crust 2. Mantle 3. Core

3 Baker 7th grade science 2003- 2004 Crust (1) This is the outermost layer of the Earth. (2) This is the layer we walk on. (3) It is a thick, rocky skin. (4) If we think of the Earth as a billiard ball, this crust is as thin as a postage stamp stuck on a billiard ball. (5) At its thickest, which is under mountain ranges, the crust is only about 35km (22mi) thick.

4 Baker 7th grade science 2003- 2004 And what type of crust would you like with your Earth? There are two types of crust

5 Baker 7th grade science 2003- 2004 Continental Crust: 1. Makes up the continents 2. Contains light colored rocks such as granite. 3. Floats high on the mantle

6 Baker 7th grade science 2003- 2004 (i) Oceanic Crust 1. Makes up the ocean floor 2. Contains the dense rocks such as basalt Thinner than the continental crust

7 Baker 7th grade science 2003- 2004 Mantle (1) Hotter and denser than the crust because the deeper you go inside the earth, the temperature & pressure increases. (2) Made of solid rock. The Mantle is made of two zones

8 Baker 7th grade science 2003- 2004 Mantle Zones (a) Lithosphere (i) Thin, uppermost part of the mantle; cooler & less rigid (ii) 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 Magma 1. Magma (melted rock) moves like hot oatmeal. Uneven heating causes material in the mantle to constantly and slowly rise & fall in convection currents. Convection Current: process by which hot fluid rises to the surface, and then sinks again, like soup being heated in a saucepan

10 Baker 7th grade science 2003- 2004 (a) Asthenosphere Hot, weak zone directly under the lithosphere Flows at a very slow rate

11 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

12 Baker 7th grade science 2003- 2004 The core is made of two layers (1) Outer core: molten & is responsible for the Earth’s magnetic field. Inner core: solid


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