Chemistry 4

2. The type of digestion that treats effluent in waste water treatment.
6. What planet has an atmosphere that resembles the Earth's first atmosphere?
7. A human product that can contaminate water sources.
13. A process that can carry on indefinitely without affecting future generations.
15. The amount of greenhouse gases emitted over the full lifecycle of a product.
16. and Algae What two types of organisms were the first to produce oxygen?
18. Removal of solids from water
19. The process of killing microorganisms in water.
21. What greenhouse gas is released by cattle farms?
22. The correct term for destruction of forests.
23. Which gas burns with a squeaky pop?

1. What is bleached by chlorine gas?
3. A resource that can be replaced at the same rate it is used.
4. What released the gases that made up the Earth's first atmosphere?
5. A material that contains only one element or compound.
7. The formation of which rock type removed CO₂ from the air?
8. Making salt water drinkable.
9. The main pollutant from agriculture that can affect rivers.
10. What gas made up the majority of the Earth's early atmosphere?
11. What process created the oxygen in the atmosphere?
12. A product made from an artificial process.
14. Water that is drinkable
17. What chemical is used to test for Carbon Dioxide?
20. The type of digestion that treats solid matter in waste water treatment.