The Three main cycles of an  ecosystem are the water cycle, the carbon cycle and the nitrogen cycle. The cycles working together and balance are responsible for caring away waste materials and replenishing the ecosystem with the nutrients necessary for life to succeed.

In biochemistry the carbon cycle is a series of processes by which carbon compounds are interconverted in the environment. Chiefly this involves the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms and the burning of fossil fuels.

The Water cycle begins with precipitation, water evaporates from lakes rivers and oceans into the atmosphere, the water vapors gather to form clouds, the clouds become rain.

The nitrogen cycle. All living organisms contain the element nitrogen. Green plants are the main converters of inorganic nitrogen to organic forms.

The earth has been recycling water for 4 billion years. The water cycle has no beginning or end it is continuous. The sun heats up the water from the oceans, lakes and rivers. The water changes into water vapor by the process of evaporation. Plants also lose water in the form of water vapor from their leaves into the air by the process of transpiration. Water collects of water vapor in the sky and makes clouds. When the water in the clouds gets cold it becomes liquid again in a process called condensation. Then the water falls from the sky as rain, snow, sleet or hail called precipitation. The water sinks into the surface and collects into lakes, oceans and rivers. It evaporates all over again and continues the cycle.

Water / Carbon/ Nitrogen Cycle Games

Water Cycle

Water - A Never-ending Story

 Clouds

Safe Drinking Water

Water Treatment games

My Forest Temple Game

Fun Classroom Games with Trees

Forest Biome Spotter

Arctic Ocean Biome Ecosystem

The Forest Hunter Blue Planet

Life in the Forest Biome Habitat game

Simple Identification Guide for: Habitat in the Pond

Water Safari life in the Biome game

Ecosystem Showdown Forest Habitat  game

Biodiversity Forest Biome Games

Bass Fishing River Habitat Games like Asteroids

Fish, Coral, Marine Animals

Science Games

 Frogs

Insects

 Pond Life

Science Games

Ecology

Rainforests

Forests

Savannas

Swamps

Under the Sea

The Rock Cycle

Water Cycle for Kids

Carbon Cycle for Kids

FLASH Biogeochemical Cycles

Energy