Chapter 7 Section 1 Pgs

Composition of the Earth Divided into 3 layers: Crust Mantle Core Compound – substance made of two or more elements

CRUST The outermost layer km thick Thinnest layer 2 types of crust: Continental- thick Oceanic-thin

MANTLE Between the crust and core Thick Contains most of Earth’s mass Scientists can’t get to it so they study it by looking at magma from volcanoes

CORE From the mantle to the center of Earth Innermost layer Makes up 1/3 of Earth’s mass

Physical Properties of Earth Divided into 5 physical layers: Lithosphere Asthenosphere Mesosphere Outer Core Inner Core

Lithosphere Outermost layer - rigid Made of crust and upper mantle Divided into pieces called tectonic plates.

Asthenosphere Below Lithosphere Pieces of lithosphere (called tectonic plates) move on top of this layer Made of solid rock that flows slowly

Mesosphere Below the asthenosphere Strong lower part of mantle Extends to the Earth’s core

Outer Core Liquid layer of core Surrounds inner core

Inner Core Solid dense center

Quiz 1. Name the three main layers of the Earth. 2. Which layer is the most dense? 3. Which layer is the thinnest? 4. What are the two types of crust? 5. Which layer contains most of Earth’s mass? 6. What two layers make up the lithosphere? 7. The lithosphere is divided into pieces called: 8. Pieces of lithosphere move on top of this layer: 9. The Asthenosphere is said to be “plastic”. What does this mean? 10. Which layer, inner core or outer core, is liquid? 11. Which layer, the inner core or the outer core, is solid?

Answers 1.Crust, mantle and core 2. Core 3. Crust 4. Continental and oceanic 5. Mantle 6. Crust and upper mantle 7. Tectonic Plates 8. Asthenosphere 9. Because it is very hot and made of partially molten rock it bends and can be pushed and deformed due to the pressure placed on it from deep within the Earth. 10. Outer core 11. Inner core