Earth and Moon vocab

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Across
  1. 3. the layer of gases surrounding a planet, star, or other celestial body, held in place by that body's gravity
  2. 7. the large, dark, flat plains on the surface of the Moon
  3. 8. the thick, rocky layer inside a planet or moon that lies between the outer crust and the central core.
  4. 10. energy vibrations that travel through the inside of a planet, moon, or star.
  5. 11. bright, long streaks of material that fan out across the surface of the Moon from impact craters
  6. 13. an astronomical event that happens when the Moon passes directly between the Earth and the Sun, blocking all or part of the Sun's light from reaching Earth
  7. 14. a measure of how tightly packed the matter is inside a star, planet, or space object
  8. 15. a celestial body takes the exact same amount of time to spin once on its axis as it does to complete one orbit around its parent body
  9. 19. an astronomical event that happens when the Earth moves directly between the Sun and the Moon, blocking sunlight from reaching the lunar surface and casting a shadow on the Moon
  10. 21. a supercontinent that contained almost all of Earth's landmass about 300 to 200 million years ago
  11. 22. the spontaneous breakdown of unstable atomic nuclei, which releases energy and subatomic particles into space, turning those atoms into different elements
Down
  1. 1. the bulk movement of hot gas or plasma rising and cooler gas or plasma sinking to transport heat.
  2. 2. the process where a planet's atmosphere traps solar heat, making the surface warmer than it would be without an atmosphere
  3. 4. the apparent bending of the path of a moving object, air, or liquid caused by a planet's rotation
  4. 5. narrow depressions or trenches on the surface of the Moon (and some other planetary bodies) that resemble canyons or dried riverbeds
  5. 6. the light-colored, heavily cratered, and mountainous regions of the Moon's surface
  6. 9. a type of seismic body wave that shake the ground or material from side-to-side or up-and-down, moving perpendicular (at right angles) to the direction the wave is traveling
  7. 11. the process where a planet or moon's crust pulls apart and cracks due to internal forces
  8. 12. the process where a planet's organisms use light from their parent star to create chemical energy
  9. 13. the process where one tectonic plate sinks beneath another plate into a planet's interior.
  10. 16. a sphere that is slightly flattened at the top and bottom and stretched wider around the middle
  11. 17. the scientific theory that a planet's rigid outer shell is broken into moving pieces that glide over a softer, hotter inner layer
  12. 18. a natural light display in the night sky, usually seen near Earth's North and South Poles
  13. 20. a bowl-shaped depression on the surface of a planet, moon, or other space body
  14. 21. a fast-moving, push-pull sound or compression wave that travels through solids, liquids, and gases