The Earth is composed of four main layers - the crust, mantle, outer core, and inner core. The crust and upper mantle make up the lithosphere, which is rigid, while the lower mantle and outer core are more plastic and move via convection currents. Earth's magnetic field originates from the flow of molten iron in the outer core.

1. Earth’s
Interior

2. Basic Facts:
1. 4.6 billion years old
2. Made mostly of rock
3. 71% of surface covered with water
4. Slightly flattened sphere
5. Rotates on its axis

3. What are the layers of the Earth?
 Crust
 Mantle
 Outer Core
 Inner Core

4. Crust:
 Thin, solid outermost layer of the Earth that
makes up less than 1% of the volume of the
Earth
 Two Types of Crust:
 Oceanic – more dense, younger
 Continental – less dense, older

5. Mantle:
 Layer of “solid-ish” rock located between the
crust and the core
 able to move through convection currents
 denser than the crust
 makes up 2/3 of the mass of the Earth

6. What is the difference between
the lithosphere and the
asthenosphere?
 Lithosphere – rocky portion, rigid, crust and part of
upper mantle
 Asthenosphere – plastic solid, moves due to higher
temperatures, part of upper mantle

7. Core:
 Central part of the Earth below the mantle
 Two Parts:
 Outer Core – Liquid
 Inner Core - Solid

8. Where does Earth’s magnetic
field come from?
 The Earth creates a magnetic field due to the
flow of iron/nickel materials in liquid outer core