Ecosystems <ul><li>Communities interact with their environment </li></ul>
Living things don’t just interact with each other in a community. cc licensed flickr photo by jfortugaleza: http://flickr.com/photos/30594175@N05/3230112383/ They also interact with the non-living components of their environment
Ecosystem - an area in which a community interacts with its non-living environment
Two components of an ecosystem: biotic - living (i.e. the community) abiotic - non-living
Matter within an ecosystem is recycled in biogeochemical cycles. cc licensed flickr photo by lanier67: http://flickr.com/photos/lanier67/184302007/ pathway through which a chemical element or substance moves through both biotic and abiotic components
Evaporation - liquid water absorbs heat to become water vapour
Condensation - water vapour in air condenses into tiny liquid water droplets
Evapotranspiration - water evaporates from the leaves of plants
Sublimation - solid ice/snow turns directly into gaseous water vapour.
Precipitation - water droplets in air fall to surface of earth as liquid rain or solid snow/hail.
Infiltration - liquid water seeps into soil to become groundwater
Discharge - groundwater drains into rivers or lakes
Storage - water can remain for extended periods in underground reservoirs called aquifers.