Happy Lesson

1. Happy Lesson The Earth’s Crust Adapted from: http://www.quia.com/tq/284995.html Grades 5-7

2. We live on the earth's crust, which is a thin layer of ___on the Earth's surface. • rock (correct answer)• soil• water

3. 2. The solid rocky outer layer of the Earth, consisting of the crust and the outer part of the mantle, ____form(s) a continuous unbroken covering around the Earth. • does• does not (correct answer)

4. This rocky layer is divided into sections called ___. • plates (correct answer)• continents• oceans

5. These _____move around or "float" on top of the gooey molten rock that makes up the softer mantle. • plates (correct answer)• pieces• sections

6. What happens when these plates move?• [A] They can collide. (correct answer)• [B] They can move apart. (correct answer)• [C] They can slide past each other. (correct answer)• [D] They can combine to form one plate

7. 6. As the plates move apart, magma(molten rock) oozes up and forms new crust in the form of a _____along the ocean floor. One such ridge can be found along the middle of the Atlantc Ocean. • ridge (correct answer)• trench

8. 7. Volcanoes and oceanic trenches partly encircling the Pacific Basin form the so-called    , a zone of frequent earthquakes and volcanic eruptions. • Ring of Fire (correct answer)• Circle of Life

9. 8. When two continents meet head-on, neither is subducted. Instead, the crust tends to buckle and be pushed upward or sideways. Some of the world's tallest mountains are a result of    • continental-continental convergence (correct answer)• oceanic-oceanic convergence

10. 9. New crust is formed as the plates pull away from each other. This describes _____. • divergent boundaries (correct answer)• convergent boundaries• transform boundaries (slidiing boundaries)