Across
- 3. Jupiter, Saturn + Neptune are all made mainly of this molecule
- 7. This is a landform we studied on Mars, was most likely formed by flowing water
- 9. The solid, rocky surface of a planet
- 10. Mercury, Venus, Earth + Mars have this kind of surface
- 12. The mixture of gases surrounding a planet
- 13. A group of parts that interact to form a complex whole
- 14. These planets are far from the Sun and mostly made of gas molecules + ice
- 15. All the liquid and frozen water on Earth
Down
- 1. This type of rock is formed by flowing lava
- 2. These planets have solid, rocky surfaces
- 4. This contains all of the galaxies, solar systems, planets, stars and matter.
- 5. A physical feature of a planet, examples are channels, mountains and volcanoes
- 6. This type of rock is formed by flowing water
- 8. All living things on Earth
- 11. Scientists use this type of model to test ideas and study planets that are too far/dangerous to travel to
- 16. This is a machine that traveled to the surface of Mars in order to take pictures of the landforms and conduct tests on the land