Earth and Moon Vocab.

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Across
  1. 2. The process by which plants use sunlight, carbon dioxide, and water to make food and oxygen.
  2. 5. The process where Earth’s crust breaks apart, often leading to the formation of new ocean basins.
  3. 8. Slower seismic waves that move only through solids and arrive after P-waves.
  4. 9. The fastest seismic waves, which move through solids, liquids, and gases, and are the first to be detected after an earthquake.
  5. 11. The process by which unstable atomic nuclei break down and release energy.
  6. 12. Waves of energy from earthquakes or explosions that travel through Earth.
  7. 14. The theory that Earth’s outer shell is divided into large plates that move over the mantle.
  8. 15. The movement of heat through fluids (liquids or gases) caused by hotter, less dense material rising and cooler, denser material sinking.
  9. 17. The dark, flat plains on the Moon formed by ancient volcanic eruptions.
  10. 20. The amount of mass in a given volume; how tightly matter is packed together.
  11. 21. The warming of a planet’s surface caused by gases in the atmosphere trapping heat.
  12. 23. The way Earth’s rotation causes moving air and water to turn and twist rather than move in a straight line.
  13. 24. An event where the Earth passes between the Sun and the Moon, causing Earth’s shadow to fall on the Moon.
Down
  1. 1. When an object’s rotation period matches its orbit period, so it always shows the same face to the object it orbits (like the Moon to Earth).
  2. 3. The bright, mountainous regions on the Moon’s surface
  3. 4. An event where the Moon passes between the Earth and the Sun, blocking the Sun’s light.
  4. 6. A supercontinent that existed about 300 million years ago, made up of all Earth’s continents joined together.
  5. 7. The shape of Earth (and some other planets)—slightly flattened at the poles and bulged at the equator.
  6. 10. Bright streaks radiating from some lunar craters, formed by debris from impacts.
  7. 13. A natural light display in the sky, typically near the polar regions, caused by charged particles from the solar wind interacting with Earth’s atmosphere.
  8. 15. Circular depressions on a planet or moon, usually formed by impacts from meteoroids.
  9. 16. The thick layer of rock between Earth’s crust and core.
  10. 18. The process where one tectonic plate moves under another and sinks into the mantle.
  11. 19. The layer of gases that surrounds a planet.
  12. 22. Long, narrow valleys or trenches on the Moon’s surface, believed to be formed by volcanic or tectonic activity.