Across
- 5. a flow of liquid or gas caused by part of it being heated or cooled more than the rest.
- 6. a natural satellite of a planet.
- 8. a piece of rock or metal that has fallen to the Earth’s surface from outer space.
- 11. a small body moving in the solar system that would become a meteor if it entered the Earth’s atmosphere.
- 13. when rocks are worn away or broken up by physical processes such as changes in temperature.
- 15. the part of the Earth below the crust.
- 17. a model of the solar system which stated that the Sun is the centre of the solar system.
- 18. a cloud of gas and dust in outer space.
- 20. a huge ball of gas that gives out heat and light energy.
- 22. the two halves of a sphere – the shape you would get it you cut a solid ball in half.
- 26. an energy resource that will never run out (e.g. solar power)
- 31. the ability to withstand wear, pressure or damage.
- 33. a small lump of dirty ice orbiting the Sun.
- 34. a rock formed from interlocking crystals.
- 37. these are resources that will one day run out.
- 38. a rock formed from grins stuck together. The grains are often rounded.
- 39. all the galaxies and the space between them.
- 41. a star with planets and other objects orbiting it.
- 42. a rock formed from interlocking crystals that are often lined up in layers.
- 45. the galaxy that our Solar System is in.
- 46. molten rock beneath the surface of the Earth.
- 47. the force of attraction between any two objects. The Earth is very big and so has strong gravity that pulls everything down towards it.
- 49. molten rock that runs out of volcanoes.
- 50. rocks that contain sufficient metal compounds that it can be extracted to produce pure metal.
- 51. getting rid of objects at the end of their use.
- 53. rock an igneous rock that has formed above the crust in the air or water. They have small crystals.
Down
- 1. anything that orbits a planet.
- 2. substances that do not break down naturally for many years when disposed of.
- 3. large area in which rubbish is left.
- 4. the solid rocks at the surface of the Earth.
- 7. these are materials that come from the Earth (minerals, metals, water etc).
- 9. the length of time it takes a planet to go around the Sun once. One year on Earth is 365.25 days.
- 10. the distance that light travels in one year.
- 12. the path that a planet takes around a star, or the path that a moon or satellite takes around a planet.
- 14. millions of stars grouped together.
- 16. the layers of gases that surround the Earth.
- 19. single landmass of the Earth’s continents millions of years ago.
- 21. the chemicals that rocks are made from.
- 22. the line at which the Earth’s surface and the sky appear to meet.
- 23. oval shaped. The shape of a planet’s orbit around the Sun.
- 24. when rocks are broken up by physical, chemical or biological processes.
- 25. a model of the solar system which stated that the Earth was the centre of the solar system.
- 26. all the processes which form sedimentary, igneous and metamorphic rocks linked together.
- 27. the movement of loose and weathered rock.
- 28. the point in the sky or celestial sphere directly above an observer.
- 29. when rocks are broken up or worn away by chemical reactions, usually with rainwater.
- 30. a way of living that does not use up non-renewable resources or harm things in our surroundings. Something that is sustainable allows things to continue into the future.
- 32. able to be broken down by bacteria or other living organisms.
- 35. an igneous rock that has formed underground slowly. They have large crystals.
- 36. when rocks are worn away or broken up due to the activities of living things. For example, growing plant roots can split rocks apart.
- 40. using a material again, often by melting it and using it to make new objects.
- 43. tiny pieces of plastic that can build up in the environment and living things.
- 44. when an object is used again, without being broken up or recycled.
- 48. porous rocks have tiny holes in them.
- 52. the theory that pieces of the Earth’s crust moved through the rocks beneath the ocean.