Across
- 4. A region of space where gravity is so strong that nothing not even light can escape
- 5. The thick layer of hot rock located between Earth's crust and core
- 6. The preserved remains or traces of an ancient organism found in rock
- 9. The scientific study of space stars planets and the universe
- 11. Water falling from clouds to Earth as rain snow sleet or hail
- 12. The amount of dissolved salt contained in a body of water
- 13. The release of gas heat or light into the atmosphere
Down
- 1. Hot liquid rock located beneath Earth's surface
- 2. The curved path an object takes as it revolves around a star or planet
- 3. Organic matter from plants and animals used as a source of energy
- 5. A piece of space rock that survives falling through the atmosphere and lands on Earth
- 7. The distance between the crests of two consecutive waves of light or sound
- 8. Relating to or powered by energy from the Sun
- 10. The eruption of molten rock onto the surface of Earth
- 13. A planet that orbits a star outside our solar system