Science

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Across
  1. 3. Contains two or more substances mixed together, but not chemically joined. This could be a mixture of elements, compounds, or elements and compounds.
  2. 6. The flash of light produced when a meteoroid enters Earth’s atmosphere. The flash of light is produced when air in front of the meteoroid is rapidly compressed because of the high speed it is travelling. This generates large amounts of heat that cause it to glow.
  3. 8. An object made of rock and/or metal that orbits the Sun. They are smaller than planets and are not sphere shaped. Most are found in the Asteroid Belt.
  4. 11. A substance made up of only one kind of atom that cannot be split into anything simpler.
  5. 12. These are the smallest type of microbe.They are very simple and do not even have cells.They invade cells of other living things and use them to reproduce, eventually destroying the cell. This is how they cause diseases.
Down
  1. 1. A substance that is made up of atoms of more than one element that are chemically joined
  2. 2. A flow of charged particles through a circuit. In electric circuits, these charged particles are electrons, which are moved around a circuit by the power supply (a cell or power pack).
  3. 3. most meteoroids burn up when travelling through the atmosphere. If they manage to reach the surface of earth they are known as a meteorite.
  4. 4. A single-celled organism, the cells are different from ours because they do not have a nucleus, they need food, warmth and moisture to grow.
  5. 5. Balls of ice, rock and dust that orbit the sun in an elliptical orbit. When they get closer to the sun the ice begins to let causing a ‘tail’ of debris behind it.
  6. 7. An object that orbits a planet. Humans have made artificial versions of these that have many uses. e.g. predicting weather, taking photographs of Earth and other parts of the universe, sat-nav and communication.
  7. 9. These can be single or multicellular, they include things such as mushrooms, moulds and yeast. They live on decaying or living tissue. They decompose the tissue and use it as their food source.
  8. 10. A piece of space debris that enters Earth’s atmosphere.