Global Systems

3. /A scientific word for decaying.
4. /A group of animals which include starfish, sea urchins and sea cucumbers.
5. /Tiny, microscopic animals living in the ocean which absorb carbon dioxide from the atmosphere.
6. /The most abundant gas in the Earth's atmosphere.
7. /A scientific word for breathing.
8. /The Earth's sphere containing the crust, mantle, inner core and outer core of the Earth.
9. /The removal of trees from forests for human use.
10. /The 'icy' continent.
13. /This process is used by plants to convert sunlight into energy.
16. /A tiny Island nation in the South Pacific is predicted to disappear underwater within the next 50-100 years.
17. /We are an example of this type of animal. Kangaroos, goats and whales also belong to this group.
19. /The day-to-day conditions of a place including air temperature, humdity and precipitation levels.
21. /Farming is an example of this.
22. /The sixth element on the Periodic Table of Elements. 23% of our body is made up of it.
23. /....... bears live in the Arctic and their habitat is under threat from the ice caps melting.

1. /This occurs when toxic chemicals are released into the environment.
2. /These types of gases are what keep the Earth warm. They include carbon dioxide, nitrous oxide and water vapour.
3. /This is occurring across the globe where arable land is being transformed into desert land, unfit for agricultural uses.
11. /The southernmost state in Australia.
12. /The weather of a place averaged over approximately 30 years.
14. /The Earth's sphere containing the oceans, glaciers and fresh water bodies.
15. /We breathe in this gas.
18. /....... bleaching is a huge concern for the future as coral reefs are hugely important in the marine world.
20. /The Earth's sphere containing all life forms including us, humans.
21. / The Earth's sphere which consists of a thick gaseous layer surrounding the Earth.