How do organisms move away from carbon into the soil?

What is cellulose?

Which part of the carbon cycle involves animals breathing in oxygen and out carbon dioxide?

Where are most of the earth's oxygen located? Name one!

Why is the rise of atmospheric oxygen relatively stable despite the burning of fossil fuel and the reduction of forests?

How do humans get nitrogen?

These three important types of organic materials require nitrogen. What are they?

Ammonium (NH4) stays in soil, while nitrate (NO3) is easily leached out. Why do they behave so differently?

In what ways to the phosphorus cycle have an affect on humans?

The phosphorus cycle is fundamentally different from the nitrogen and sulfur cycles. How so?

Why does water vapour condense when it moves far above the earth?

How does global warming affect the hydrologic cycle?

What is the equation for respiration?

What happens to the phosphorus that is carried by runoff to the oceans?

If ground water reaches the surface, how does it re-enter the water cycle?