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4.1 Checking For Understanding – part 1
20 Points
The answers to all of these questions can be found in section 4.1 (p. 63-67) in your textbook.
1. Look at the diagram of the earth on p. 63. About how far is it from the surface to the center of
the planet?
2. What does the theory of continental drift tell us?
3. How do you think the earth would look different if plates moved 100 miles in a year instead of
a few inches?
4. Are tectonic plates more active at the edges or middle? Why?
5. The edges of tectonic plates are often more rugged than the middle areas. Why do you think
this is true?
6. What sorts of tectonic activity would you find at the edge of tectonic plates?
7. The western edge of the North American plate is very active. What plates come together at the
western edge of North America? (map, top of p. 64)
8. Aside from South America, what two continental plates were touching North America during
the time of Pangaea? (map, bottom of p. 64)
9. What three types of movement are possible at plate boundaries?
10. Most spreading plate boundaries are found where? What landform will we find there?
11. If a plate-spreading boundary is found on land, what is the resulting landform?
12. When a continental plate and an oceanic plate collide,
• What landform do we find in the sea?
•
What do we find on the land?
13. What happens when two continental plates collide?
14. How is a fold different than a fault?
15. What sorts of things happen when plates move laterally past one another?
16. Look at the map at the top of pages 64 and the picture at the top of page 65 to answer the
following questions about what landforms occur at plate boundaries: (refer to questions 9-13)
a. What will you find where the Nazca Plate and the South American plate collide?
b. What will you find where the African Plate is moving away from the North and South
American Plates?
c. What do you find where the Indo-Australian Plate collides with the Eurasian Plate (near the
red arrow)?
4.1 Checking For Understanding – part 1
Directions – read section 4.1 (p. 63-69) in your textbook and answer the following questions:
1. Look at the diagram of the earth on p. 63. About how far is it from the surface to the center of
the planet?
About 4000 miles
2. What does the theory of continental drift tell us?
How the continents got in their current
positions
3. How do you think the earth would look different if plates moved 100 miles in a year instead of
a few inches?
4. Are tectonic plates more active at the edges or middle? Why? At the edges, because that’s
where they rub against other plates
5. The edges of tectonic plates are often more rugged than the middle areas. Why do you think
this is true?
Little tectonic activity in the middle; mostly just erosion
6. What sorts of tectonic activity would you find at the edge of tectonic plates? Earthquakes,
volcanoes, etc
7. The western edge of the North American plate is very active. What plates come together at the
western edge of North America? (map, top of p. 64) N America plate, Juan de Fuca plate,
Pacific plate
8. Aside from South America, what two continental plates were touching North America during
the time of Pangaea? (map, bottom of p. 64) Eurasian plate, African plate
9. What three types of movement are possible at plate boundaries?
Move apart or spread,
come together or collide, slip past each other or move laterally
10. Most spreading plate boundaries are found where? What landform will we find there there?
Under oceans; mid-ocean ridge
11. If a plate spreading boundary is found on land, what is the resulting landform?
Rift valley
12. When a continental plate and an oceanic plate collide,
• What land form do we find in the sea?
Trench
• What do we find on the land?
Mountain range
13. What happens when two continental plates collide? High mountain range
14. How is a fold different than a fault? Folds are bent, faults are broken
15. What sorts of things happen when plates move laterally past one another? Low range of
mountains is built; earthquakes
16. Look at the map at the top of pages 64 and the picture at the top of page 65 to answer the
following questions about what landforms occur at plate boundaries: (refer to questions 9-13)
a. What will you find where the Nazca Plate and the South American plate collide? Trench in
ocean, mountains on land
b. What will you find where the African Plate is moving away from the North and South
American Plates? Mid-ocean ridge
c. What do you find where the Indo-Australian Plate collides with the Eurasian Plate (near the
red arrow)?
High mountain range