What is the biosphere?

How does the water cycle work?

What happens to some of the snow that does not melt?

What happens to some of the water that does not make its way back into the ocean and lakes?

What are the three states water exists in?

What is ice's special quality?

What would happen if that special quality didn't exist?

What would happen without the insulating layer offered by the ice wasn't there?

What is one special quality about liquid water?

What happens to the water when it cools down?

Why would steam from the mouth of a boiling kettle burn you more than boiling liquid water?

What are the processes in the water cycle that include the change of state?

What do these processes involve?

Where does energy for all these processes come from?

What absorbs the energy?

What is the carbon cycle?

How much carbon dioxide forms a part of the Earth's atmosphere?

What happens when living organisms die?

What are decomposer organisms?

What is nitrogen?

How much of the atmosphere does nitrogen make up?