FREE SAMPLE: OCR A Level Geography Earth's Life Support System Summary - 1a (Water and carbon support life on Earth and move between the land, oceans and atmosphere)
1.2. How important are water and carbon to life on Earth?
1a. Water and carbon support life on Earth and move between the land, oceans a
Importance of carbon: The water and carbon cycles:
Carbon is a common chemical element, stored in Atmosphere = the thin envelope of gases (mainly nitroge
carbonate rocks such as limestone, seafloor Biosphere = the space at the Earth’s surface & within the
sediments, ocean water (as dissolved CO2), the
atmosphere (CO2) & in the biosphere Evapotranspiration = combined loss of water at the sur
Apart from its biological significance, carbon is used by plants
as an economic resource The cycling of individual water molecules & carbon
- Fossil fuels such as coal, oil & natural gas power days to millions of years
the global economy Water moves between stores through the processes
- Oil is also used as a raw material in the off & groundwater flow
manufacture of products ranging from plastics to
Photosynthesis = process by which green plants conver
paint & synthetic fabrics
presence of sunlight
- Agricultural crops & forest trees also store large
amounts of carbon available for human use as Respiration = the process in living organisms where
food, timber, paper, textiles & many other substances to produce energy & release CO2
products Oxidation = a chemical process that whethers certain ty
oxygen from either the atmosphere or water by rock min
Water & carbon cycles as open & closed systems: Weathering = the in-situ breakdown of rocks at or near
Systems are groups of objects & their relationships biological processes
that bind the objects together The global carbon cycle also contains a series of store
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