let’s look at the earth

Let’s look at the Earth

The Inside of the Earth is made of Several Layers

The Crust:A Thin Rock Material

The Mantle:A Dense and Mostly Solid Rock Material

The Outer Core:Liquid Iron and Nickel

The Inner Core:Solid Iron and Nickel

How Do We Know This?

The Outer Core:Liquid Iron and Nickel

The Inner Core:Solid Iron and Nickel

The Mantle:A Dense and Mostly Solid Rock Material

The Crust:A Thin Rock Material

Why do the layers of the earth float on one another?

DENSITY

Density determines a layer’s location!

Why does any layer float?• It is less dense than the one

under it!

Why does any layer sink?• It is more dense than the one

above it!

Density

The Density of Earth is 5.53 gm/cm3

We know the surface of the Earth is covered with Rocks

The Land is covered mostly by a type of rock called

Granite

(density of Granite = 2.6 gm/cm3)

The Ocean is mostly covered by a type of rock called Basalt

The Land is covered mostly by a type of rock called

Granite

Granite = 2.7 gm/cm3

Basalt = 3.3 gm/cm3

Neither of these Rocks is dense enough to account for

the density of the Earth

Basalt = 3.3 gm/cm3

Iron has a density of 7.9 gm/cm3

Basalt = 3.3 gm/cm3

Iron has a density of 7.9 gm/cm3

So we believe the inside of the Earth is made of a heavy element

such as Iron or Nickel(density of Nickel = 8.9 gm/cm3)

Density of Rocks 3 gm/cm3

Density of Iron/Nickel 8 gm/cm3

Earth's Interior Structure

Average density

CrustMantleCore

5.5 g/cm3

3 g/cm3

5 g/cm3

11 g/cm3

Earth must have been molten once, allowing denser material to sink, as it started to cool and solidify.

Density increases with depth !

Density of Iron/Nickel 8 gm/cm3

So we believe about ½ the Earth is a Rock-like material and the other ½ a heavy metal such as iron and nickel

The density of the Earth will be the average of the two:

let’s look at the earth

gmcm3the density of

earth float

gmcm3 density of rocks

gmcm3 granite

gcm35 gcm311 gcm3 earth

type of rock

solid iron

rock materialwhy

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