science

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Across
  1. 2. layers of gas that surround a planet
  2. 4. a large, circular pit in the surface of a planet or other body in space
  3. 7. a large circular mass that revolves around a star
  4. 8. a change in velocity
  5. 9. a force that exists between any two objects that have mass
  6. 10. the energy an object has due to its motion
  7. 12. the amount of matter in an object
Down
  1. 1. a pull or push that is applied to an object
  2. 3. the speed and direction of moving objects
  3. 5. a small object made of rock
  4. 6. a streak of light in the sky that forms when a piece of rock from space burns up in Earth's atmosphere
  5. 11. a body of ice and dust that travels in a long narrow orbit around the sun