UNIT 4 LESSON 1 – EARTH’S LAYERS NOTES
(Pages 192 – 199)
Indirect evidence (not in book)
1. No one has seen the mantle or the core. How did scientists develop this model of Earth’s interior?
Seismic waves –
a. P waves (primary) –
b. S waves (secondary)
Compositional Layers
1. How many compositional (chemical) layers does Earth have? ____________________________________________2. Describe each.
A. Outer most layer is called the _________________________--.
1. Name the two types: ______________________________ __________________________________
2. These layers are made mostly from ____________________________,
__________________________
and _____________________________________,
3. Compare and contrast the continental and oceanic crusts.
B. The middle layer is called the ___________________________________.
1. Describe this layer.
2. How does convection work in this layer?
3. What are the common elements in this layer?
C. The innermost layer of the Earth is the ______________________________________.
1. This layer is made mostly of _____________________________ and __________________________.
2. This layer makes up about ____________________ of the Earth’s mass.
Physical layers
3. How many physical layers does the Earth have? ____________________________-4. What properties did scientists use to develop these layers?
1.
2.
5. Describe the properties of these layers.
1. Lithosphere –
2. Asthenosphere –
3. Mesosphere –
4. Outer core –
5. Inner core –