1. Chapter 20 – Mountain Building
20.1 – Crust-Mantle Relationship

2. Topography Variation in elevation of the crust Figure 20.1, page 562

3. Two types of Crust Continental Crust Made of granitic rock
Thicker, less dense
Extends higher above surface and deeper into mantle
Figure 20.3
page 563
Oceanic Crust
Made of basalt rock
Higher density

4. Isostasy
Condition of equilibrium that describes displacement of mantle by continental and oceanic crust
Gravity presses down
Buoyancy pushes up

5. Roots
Thickened areas of continental material that extend into mantle below mountain ranges

6. Isostatic Rebound
Slow process of crust rising as a result of removal of overlaying material
For instance, erosion
Ice sheets

7. In-Class Assignment Problem Solving Lab, pg. 565 With a partner
Grab graph paper off table