Cycling of Matter https://www.youtube.com/watch?v=09_sWPxQymA&list=PLpY1vr2YbOfAJAAmqzq7mpozSfHce8kVU&index=4

Cycles in the Biosphere Energy is transformed into usable forms to support the functions of an ecosystem The cycling of nutrients in the biosphere involves both matter in living organisms and physical processes found in the environment such as weathering

Biogeochemical Cycles A pathway by which a chemical element moves through both biotic and abiotic parts of an ecosystem Chemical elements such as oxygen, carbon, nitrogen, and phosphorus, circulate from the environment into plants and animals and back again into the environment

Types of Cycles Water Cycle

Types of Cycles Carbon and Oxygen Cycle

Types of Cycles The Nitrogen Cycle

The Nitrogen Cycle The capture and conversion of nitrogen into a form that is useable by plants is called nitrogen fixation Nitrogen is returned to the soil in several ways: Animals urinate Organisms die Organisms convert ammonia into nitrogen compounds Denitrification

Denitrification A microbially facilitated process where nitrate is reduced and ultimately produces molecular nitrogen (N2) It is returned to the soil to be reused and becomes part of the nitrogen cycle again

Types of Cycles The Phosphorous Cycle