Global Systems

3. We breathe in this gas.
7. The weather of a place averaged over approximately 30 years.
8. The Earth's sphere containing the oceans, glaciers and fresh water bodies.
11. This occurs when toxic chemicals are released into the environment.
12. A scientific word for decaying.
13. This process is used by plants to convert sunlight into energy.
14. The Earth's sphere which consists of a thick gaseous layer surrounding the Earth.
15. The Earth's sphere containing all life forms including us, humans.
17. The sixth element on the Periodic Table of Elements. 23% of our body is made up of it.
18. A scientific word for breathing.
19. The 'icy' continent.

1. These types of gases are what keep the Earth warm. They include carbon dioxide, nitrous oxide and water vapour.
2. ....... bleaching is a huge concern for the future as coral reefs are hugely important in the marine world.
4. The Earth's sphere containing the crust, mantle, inner core and outer core of the Earth.
5. A tiny Island nation in the South Pacific is predicted to disappear underwater within the next 50-100 years.
6. The day-to-day conditions of a place including air temperature, humdity and precipitation levels.
9. The removal of trees from forests for human use.
10. Tiny, microscopic animals living in the ocean which absorb carbon dioxide from the atmosphere.
12. This is occurring across the globe where arable land is being transformed into desert land, unfit for agricultural uses.
13. ....... bears live in the Arctic and their habitat is under threat from the ice caps melting.
16. The most abundant gas in the Earth's atmosphere.