What I Know Directions: Write the letter of the correct answer before each number. 1. What is the outermost layer of the Earth?

B. mantle
A. crust
C. inner core
D. outer core

2. Which of the following best describes the Earth's outer core?

A. It consists of liquid iron and nickel
B. The area of the Earth that is sometimes called the lithosphere.
C. The thinnest layer that makes up the composition of the Earth.
D. It is under such immense pressure that, even though it is very hot, it is still a solid.

3. Which of the following seismic waves travels fastest?
A. love wave
C. rayleigh wave
B. primary wave
D. secondary wave

4. Which wave moves in an up-and-down pattern and travels only through solids?
A. love wave
B. primary wave
C. rayleigh wave
D. secondary wave

5. What is the hottest layer of the earth?

A. crust
B. mantle
C. inner core
D. outer core