topic 4

Question 1

Water Cycle

Answer 1

The water cycle shows the continuous movement of water within the Earth and atmosphere.

Question 2

Carbon Cycle

Answer 2

The carbon cycle is nature’s way of reusing carbon atoms, which travel from the atmosphere into organisms in the Earth and then back into the atmosphere over and over again.

Question 3

Nitrogen Cycle

Answer 3

The nitrogen cycle is the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it circulates among atmosphere, terrestrial, and marine ecosystems.

Question 4

Phosphorus Cycle

Answer 4

The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the geosphere, hydrosphere, and biosphere