GLOBAL SYSTEMS

4. All the water on Earth.
7. An example of a body of water that covers 71% of Earth's surface
9. Liquid which forms the seas, lakes, rivers and rain and is the basis of the fluids of living organisms.
10. The chemical element with atomic number 15, a poisonous, combustible non-metal.
15. The process by which green plants and some other organisms use sunlight to absorb nutrients from carbon dioxide and water.
17. The chemical element with atomic number 6, a non-metal which has two main forms (diamond and graphite) and which also occurs in impure form in coal, charcoal and soot.
18. The name of the process when heat is transferred by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it.
19. A gaseous sphere that envelops the Earth.
20. A phase of matter which is firm and stable in shape.

1. A phase of matter which is a substance that flows freely but is of constant volume.
2. A phase of matter which is an air-like fluid substance which expands freely to fill any space available, irrespective of its quantity.
3. The action or process of depositing a substance out of a solution.
5. An individual animal, plant, or single-celled life form.
6. All life on earth, including man, and all organisms.
8. The negative ion in CaCO3
11. The Earth's solid surface, often called crust on the Earth.
12. layer of the atmosphere that burns meteorites
13. The top layer of Earth. (2 words: First word 11 letters and second word 5 letters)
14. The chemical element with atomic number 7, a colourless, odourless unreactive gas that forms about 78 per cent of the earth's atmosphere.
16. The smallest particle of a chemical element that can exist on its own.