What is the biosphere?

What is the water cycle?

What are the states of water?

Why does ice float?

What would happen if ice sinks?

Why doesn't water heat up easily?

Why does hot steam burn more than boiling water?

Where does the energy needed for the water cycle come from?

What is the carbon cycle?

Why is CO2 important?

Why is the the carbon cycle important?

What are decomposing organisms?

Give some examples

What are fossil fuels?

How much nitrogen is in the atmosphere?

What is fixation?

What are the 3 ways nitrogen is fixed?

What is the phosphorous cycle?

What is weathering?