Across
- 1. The amount of matter in an object
- 5. A temperature scale that sets the freezing point of water at 0º and the boiling point at 100º
- 6. A dark area caused when an object blocks light falling on a surface
- 7. A natural force that causes two objects to pull toward each other depending on their mass and the distance between them
- 8. The heaviness of an object; force of gravity on mass = weight
- 9. A planet in the Solar System that has life on it
- 10. Instrument that uses a small magnet to show which direction is North (N)
- 12. A natural satellite that orbits a planet. Some planets have no moons; others have over 60 moons.
- 13. The time during rotation when the Earth faces the Sun and it is lighted; this rotation gives the false appearance that the Sun travels from east to west across the sky
- 15. The outermost covering or layer
Down
- 2. A line, real or imaginary, around which something spins
- 3. A 24-hour period, or, the time it takes the Earth to make one complete rotation on its axis
- 4. The time during its rotation when the Earth faces away from the Sun and it is dark; this rotation gives the false appearance that stars move across the sky
- 5. Bowl-shaped indents or cavities on the surface of a planet, moon, or asteroid that are caused by a collision with another object, such as a meteorite
- 11. Instrument that measures the time of day by using the position of the Sun
- 14. The path one object takes as it revolves around another object in space
- 15. The star at the center of the Solar System that supplies heat and light to Earth; its enormous gravity keeps the solar system in orbit