1. Earth’s Interior

2. Let’s Take a Journey to the Center of the Earth
There are three main layers of Earth
The CRUST
The MANTLE
The CORE
All three layers differ in size, composition, temperature, pressure & density

3. Temperature
As you travel to the center of the Earth the temperature gets warmer
For every 40 meters you descend the temperature increases 1 degree Celsius

4. Pressure PRESSURE – results when a force is pressing on an area
Pressure increases as you go deeper into the Earth

6. The Crust CRUST – layer of rock that forms Earth’s outer skin
Between 5 – 70 km thick
Crust beneath oceans = oceanic crust
Made up of BASALT – dark rock/fine texture
Crust that forms continents = continental crust
Made mainly of GRANITE – light color/coarse texture
CRUST – layer of rock that forms Earth’s outer skin
Includes both dry land and the ocean floor
Also the soil and water that covers earth’s surface
Thin layer
Thickest under mountains; thinnest beneath ocean

7. The Mantle layer of hot rock (but solid) Over 3,000 km thick
Divided into 2 layers
Upper Mantle
Lithosphere – crust and uppermost part of the mantle; about 100 km thick
Asthenosphere – upper mantle just below the lithosphere
Hotter and under more pressure
Softer/bends like plastic (but still solid)
Lower Mantle

8. The Core Made up of metals iron and nickel 2 parts…
OUTER CORE – layer of molten metal that surrounds the inner core
INNER CORE – dense ball of solid metal
Pressure squeezes the atoms of nickel and iron so much to where they cannot spread out, so they become liquid
Scientists think the movements in the liquid outer core create Earth’s magnetic field

10. Lith (o sphere) As then (o sphere)
Spell o roma
Lith (o sphere) As then (o sphere)

11. Review Questions
Why is it difficult to determine Earth’s inner structure?
What is the difference between the lithosphere and the asthenosphere?
How do temperature and pressure change as you go deeper into the Earth?
How are oceanic and continental crusts alike and different?
Place these terms in correct order so they begin at Earth’s surface and move toward the center: inner core, asthenosphere, crust, lithosphere, and outer core

12. More Review Questions 6. Write whether each statement is true or false
a. continental crust is made up of rocks such as granite
b. the relatively soft layer of the mantle is called the asthenosphere
c. the Earth’s core is made up of iron and copper