Download CH. 7 Review WS #3 - Wachter Middle School

Earth Science
Name:
Chapter Seven--Worksheet Review # 3
Class Period:
Section One: [Pages 177-180]
Directions: Use your textbook and notes to assist you with answering the following questions.
1. The theory of plate tectonics replaced the theory of
.
2. The theory of plate tectonics is that the Earth’s 2 is divided into plates that move
around on top of the 3 .
3.
4. Figure 13 of your text illustrates convection in the Earth’s mantle. The diagram below illustrates convection in a pot
of boiling water. Using the information given in Figure 13, explain why the water in the pot moves this way.
5. For convection currents in the asthenosphere, where does the heat come from?
6. When oceanic plates slide down the slope of the lithosphere-asthenosphere boundary,
the process is called
. (ridge push or slab pull)
7. When gravity starts to pull tectonic plates into the asthenosphere, the process is
called
. (ridge push or slab pull)
Using Figure 14 as a reference, choose the type of plate boundary in Column B that best matches each description in
Column A, and write the letter of the boundary in the space provided.
13. At tectonic plate boundaries, tectonic plates separate,
, or slide past each other.
14. TRUE or FALSE--When two plates collide and form a subduction zone as in Figure 14, an oceanic
plate always sinks into the asthenosphere.
15. There are three types of boundaries, and each defines the type of motion that takes place when two plates meet. Using
the following terms, label each diagram with the kind of boundary being shown.
Transform Boundary, Divergent Boundary, Convergent Boundary