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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)
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  • OCR A Level Geography Second Edition

Clear concise summary of Chapter 4, 1a (ELSS) of Michael Raw's OCR A Level Geography textbook which is linked to these documents

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  • No
  • Chapter 4, 1a (water and carbon support life on earth and move between the land, oceans and atmosphe
  • September 13, 2022
  • 1
  • 2021/2022
  • Summary

Subjects

  • geography
  • a level
  • a level geography
  • ocr
  • ocr geography
  • elss
  • year 12
  • year 13
  • carbon
  • water
  • atmosphere
  • biosphere
  • earths life support system

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  • A/AS Level
  • OCR
  • Geography
  • Earth's Life Support Systems
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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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