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