Chapter 12 Section 3 Earth’s Interior

Chapter 12 Section 3 – What You’ll Learn - page 370 Before you read - write the reading’s objectives in this space: 1 – _____________________________________________________________________________________________ 2 – _____________________________________________ ________________________________________________ ________________________________________________ ________________________________________________

How do scientists learn about Earth’s interior? Use seismic waves to gather data about Earth’s interior – kind of like a sonogram on humans! Label the diagram to the right with the general name and thickness: 5 Earth’s Interior Video 1.5 min 1

Recall what is refraction? ___________________ __________________________________________ What is a discontinuity? ___________________________________________ Andrija Mohorovičić was the first in the world to establish, on the basis of seismic waves, a surface of velocity discontinuity that separates the crust of the Earth from the mantle and which was named the Mohorovičić Discontinuity, also known as the Moho, in his honor. 2

What is the shadow zone? ___________________ ___________________ ___________________ ___________________ ___________________ ___________________ 3

Composition of Earth’s Layers describe the following: The crust and uppermost mantle (The lithosphere) _______ __________________________________________ __________________________________________ The asthenosphere _____________________________ __________________________________________ __________________________________________ Mantle below the asthenosphere __________________ __________________________________________ The cores ___________________________________ __________________________________________ __________________________________________ 4

How do astronomers think the Earth formed? ____________________ __________________________ __________________________ __________________________ __________________________ __________________________ __________________________ __________________________ __________________________ __________________________ 5

Section Check Question 1 What is Earth’s core made of?_____________________________________ _______________________________________ _______________________________________ 6

Section Check Question 2 Earth’s internal layers become _______ with depth. A. cooler B. darker C. denser D. lighter 7

Section Check Question 3 What can’t S-waves penetrate the liquid outer core? ________________________________________ ________________________________________ 8