test 3

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Across
  1. 3. A broad, raised landform that can be built by repeated spreading lava flows.
  2. 6. The vertebrate group to which frogs and toads belong.
  3. 8. The central region of the Earth, divided into inner and outer parts.
  4. 9. To move continuously from one place to another, as water does when poured.
  5. 13. The shedding of an old exoskeleton by an insect or crab.
  6. 14. The form of energy that a rolling ball has because it is moving.
  7. 15. What an object is made from, such as wood, plastic or glass.
  8. 16. The vertebrate group to which snakes, lizards and crocodiles belong.
  9. 18. The framework of bones that supports the human body.
  10. 21. Light travels in ______ lines in the tube investigation.
Down
  1. 1. The vertebrate group to which humans, whales and bats belong.
  2. 2. To move repeatedly backwards and forwards about a position, as solid particles do.
  3. 4. An event in which a volcano releases lava, gases or ash.
  4. 5. A place where two bones meet.
  5. 7. The metal named alongside iron as a main material in Earth’s core.
  6. 9. The body covering that distinguishes birds from other vertebrate groups.
  7. 10. A light ______ produces its own light.
  8. 11. What is transferred or changes form when things move, warm up or produce light.
  9. 12. The scientific word for a broken bone.
  10. 17. The process in which a child’s bones become longer and thicker as the child gets bigger.
  11. 19. Tiny fragments of volcanic rock and glass thrown out during an eruption.
  12. 20. When the forearm bends upwards, the muscle at the ______ of the upper arm contracts.