continental drift theory

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Across
  1. 1. When two tectonic plates move apart, often creating new crust, like at mid-ocean ridges.
  2. 3. A crack or split in the Earth's surface where plates move apart.
  3. 4. A huge piece of the Earth's outer shell that moves around.
  4. 6. When two tectonic plates move toward each other, often causing mountains or earthquakes.
Down
  1. 2. When two tectonic plates slide past each other, causing earthquakes along fault lines.
  2. 4. A giant landmass that existed millions of years ago, made up of all the continents together.
  3. 5. The study of how the Earth's outer layers (plates) move and change.