Across
- 2. Our Sun is named Sol, after the Latin word for Sun, "_____," and anything related to the Sun we call "solar."
- 4. It takes 12 _____, or 365 days, for the Earth to travel around the Sun.
- 6. Earth is special because it is an ocean planet. _____ covers 70% of the Earth's surface.
- 7. A solar system is a _____ of planets, moons, and the sun that they orbit around.
- 9. The planets Jupiter, Saturn, Uranus, and Neptune are called gas giants because they are mostly made up of hydrogen and _____.
- 10. A _____ is an object that orbits a planet or something else that is not a star.
- 11. Studying the solar system has taught us about gravity, the _____, and the geology of other planets.
- 15. The sun is so large that about 1,300,000 _____ Earths can fit inside of it.
- 16. People need natural resources like air and water to stay alive. We have to _____ them since many of them are limited.
- 18. The three _____ of planets in our solar system are terrestrial planets, gas giants, and dwarf planets.
Down
- 1. Because of our planet's _____, the Sun appears to rise in the east and set in the west.
- 3. Plants need _____to grow. Animals, including humans, need plants for food and the oxygen they produce.
- 5. The planets Ceres, Pluto, Haumea, Makemake, and Eris are called dwarf planets because they don’t have enough mass to clear their _____.
- 8. The shadow of an _____ would be the shortest at noon when the Sun is at its highest.
- 12. The _____ is 4.6 billion years old!
- 13. The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a hard, _____ surface like Earth.
- 14. The planets _____ around the Sun in an elliptical orbit because the Sun pulls the planets toward it with gravity.
- 17. Our moon appears to change _____ because we can only see the part of the Moon that is reflecting the Sun’s light.