1. Howard Middle School 6th Grade Earth Science
Unit D Test Review
Howard Middle School
6th Grade
Earth Science

2. Test Review
Scientific evidence suggests that the earth is billions of years old.
Continental drift is the idea that the continents were once joined together to form a large land mass.
Plate tectonics helps explain the formation of mountains.

3. Test Review
The Himalayan mountains, which are along the northern border of India, were formed by the collision of two lithospheric plates.
The distance from the earth’s surface to the center of the earth is 6,000 km.
New lithosphere is mostly created at a divergent plate boundary.

4. Test Review
The word “lithosphere” is used to refer to the crust and the upper mantle.
Earthquakes are most likely to occur at a transform boundary.
Plate tectonics refers to the theory that the surface of the earth is made up of large plates that have moved over time.

5. Test Review Which of the following statements is TRUE?
The earth’s crust moves around but is never destroyed.
New crust is always forming on the top of large mountains.
Old crust falls into the oceans and is destroyed over time.
Old crust is destroyed and new crust is formed over time.

6. Test Review
Which of the following statements provides evidence for plate tectonics?
The same kind of unusual fossils are found in South America and Africa.
The same kind of unusual rock layers are found in North America, Europe, and Africa.
The earth’s continents are moving at a rate of centimeters per year.

7. Test Review
Plate tectonics is the theory that sections of the earth’s crust have moved toward and away from each other to form continents, mountains, and oceans.

8. Short Answer
Modern humans have been on the earth for 195,000 years. Select three major events that occurred before that time and describe the order in which they occurred.
In your own words, explain:
The theory of plate tectonics
How earthquakes, volcanoes, and mountain formation are related to plate tectonics.
Be as specific as you can.

9. Short Answer What is subduction?
At what type of plate boundary does subduction occur?
Do you think nuclear waste should be stored in a subduction zone? Support your answer with at least two pieces of evidence.