Across
- 3. The Universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.
- 7. An object made of ice and dust that often has a tail of gases
- 9. The outer layer of the Earth made from rock. Split into several sections called tectonic plates.
- 12. The line at which the Earth's surface and the sky appear to meet.
- 13. The process in which materials can be used again for the same or different purpose.
- 15. Formed from cooled magma and has crystals in them. There are two types: intrusive and extrusive.
- 18. A natural satellite which orbits around a planet
- 19. Tiny pieces of plastic that can build up in the environment and in living things
- 22. No longer needed
- 24. The very hot and dense centre of our Earth. Has an inner and outer part. Made from iron and nickel.
- 26. Oval shaped
- 30. Chemicals rocks are made from (these can be metal or non-metal compounds).
- 31. A small body moving in the solar system that would become a meteor if it entered the Earth's atmosphere.
- 32. Formed when existing rock is exposed to heat and pressure over time.
- 34. Getting rid of objects at the end of their use
- 40. A group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure
- 41. This is using an object again for the same purpose.
- 42. Area of land where rubbish is buried to dispose of it
- 43. Molten rock that is expelled out of a volcano
- 44. The force of attraction between all objects. The more mass an object has, the larger the force of gravity it exerts.
- 45. These are resources that will one day run out.
- 46. Remains of dead animals and plants that died millions of years ago
Down
- 1. Substances that do not break down naturally for many years when disposed of.
- 2. The movement (transportation) of rocks by water, ice or wind.
- 4. A layer of the Earth between the crust and core. It has the properties of a solid but can flow.
- 5. The wearing down of rocks by physical, biological or chemical processes.
- 6. The time taken for a planet to make one orbit of it's star.
- 8. A material that absorbs water
- 10. Formed from sediments that have been compacted and cemented together.
- 11. Molten rock inside a volcano
- 14. current The transfer of heat through a fluid.
- 16. The use of natural resources, when it's use is kept at a steady level that is not likely to damage the environment.
- 17. drift The movement of tectonic plates.
- 20. Rocks that contain sufficient metal compounds that it can be extracted to produce pure metal
- 21. A model of the solar system which stated that the Earth was the centre of the solar system
- 23. A satellite is an object in orbit around a planet
- 25. A model of the solar system which stated that the Sun is the centre of the solar system
- 27. The distance travelled by light in one year - a very large distance, usually used to describe distances between stars. The closest star to our own is about 4.3 light years away.
- 28. Movement around an object in a circular or elliptical manner
- 29. A piece of rock or metal that has fallen to the Earth's surface from outer space
- 33. Removing metal from metal ore so it can be used to make things
- 35. Single landmass of the Earth's continents millions of years ago.
- 36. The point in the sky or celestial sphere directly above an observer
- 37. A cloud of gas and dust in outer space
- 38. A large mass at the centre of a Solar System (if there are other bodies present) that produces heat and light, eg the star at the centre of our Solar System is called the Sun.
- 39. A cluster of billions of stars, held together by gravity.