Science

1. Capable of being decomposed naturally by bacteria or other living organisms.
4. A large molecule made up of many repeating smaller units joined together.
8. A type of chemical bonding found in metals, where electrons are free to move.
9. An atom that has gained or lost electrons, giving it an overall electrical charge.
10. A subatomic particle with a positive charge found inside the nucleus.
12. The dense central core of an atom containing protons and neutrons.
13. A bond formed when non-metal atoms share pairs of valence electrons.
14. A bond formed when electrons are transferred from a metal atom to a non-metal atom.
15. Tiny pieces of plastic that pollute the environment and accumulate in food chains.
17. A chemical reaction where a fuel burns in oxygen to release energy, water, and carbon dioxide.
18. A simple hydrocarbon compound containing only single chemical bonds between carbons.
19. A subatomic particle with a negative charge that orbits the nucleus.

2. A useful material that can be extracted from the earth to satisfy human needs.
3. The basic building block of all matter, consisting of a nucleus and electron shells.
5. A product or resource sent to another country for sale, which is a major part of Australia's economy.
6. The name given to the electrons located in the outermost shell of an atom.
7. An organic compound composed entirely of hydrogen and carbon atoms.
8. The process of extracting coal, minerals, or other geological materials from the earth.
11. The process used to separate crude oil into different fractions based on their boiling points.
16. A naturally occurring solid substance mined from the ground, like iron ore or bauxite.