Across
- 3. The shaking of the ground caused by sudden movement in the Earth's crust.
- 8. Drift: The slow movement of continents across Earth's surface.
- 11. Two times a year when we have the longest day or the longest night.
- 16. Tide: When the tide is not very high or low, occurring during the quarter moons.
- 18. Ridge: An underwater mountain range where new ocean floor is made.
- 19. Tide: When the tide is very high or very low, happening during a full or new moon.
- 20. Earth traveling around the sun, taking one year to complete.
Down
- 1. Currents: Heat moves through the Earth's mantle, making the plates move.
- 2. One piece of the Earth's surface goes under another into the Earth.
- 4. A mountain where melted rock, ash, and gases come out from inside the Earth.
- 5. When one object in space moves into the shadow of another.
- 6. The regular rise and fall of the ocean's surface caused by the moon's and sun's gravity.
- 7. Spreading: New ocean floor is made at underwater mountains and slowly moves away.
- 9. Eclipse: When the Earth is between the sun and the moon, making the moon look dark.
- 10. Tectonics: The idea that the Earth's surface is made of large pieces that move.
- 12. Earth spinning around its axis, causing day and night.
- 13. Two times a year when day and night are the same length.
- 14. Eclipse: When the moon is between the sun and Earth, blocking the sun's light.
- 15. A crack in the Earth's surface where movement happens.
- 17. An imaginary line that a planet spins around.