Tectonic Forces

In this episode, find out why the arrangement of Earth's continents shifts slowly over time!

Comprehension Questions:
1. What was the name of Earth’s supercontinent that existed over 180 million years ago?
2. True or False: Earth’s surface is constantly shifting and drifting.
3. What causes Earth’s plates to move?
4. What is the name of the process in which less dense molten rock travels from the core to the surface, cools and returns?
5. Through ________, tectonic plates can raise mountains or send ocean floor to the depths of the Earth’s molten interior?

Answer Key:
1. Pangea
2. True
3. Heat from Earth’s core
4. Convection
5. Collisions

For a transcript of this video and a fun downloadable poster, visit https://spaceplace.nasa.gov/tectonics...
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