Sources of evidence of climate change
information about the sources of evidence used to find out the climates of past generations
- Created by: Phil
- Created on: 31-05-13 09:17
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- Peat bogs
- these are patches of partially decayed organic matter
- hard to grow crops
- anaerobic and acidic soil makes decay slower
- hard to grow crops
- peat is good to reconstruct climates because
- pollen from plants falls off the plant onto the ground and is stored on the surface of peat bogs
- Pollen grains have a tough outer layer which makes them hard to decay
- pollen from plants falls off the plant onto the ground and is stored on the surface of peat bogs
- each species has its own specific pollen which allows scientists to identify which plant species were about
- certain plants only grow in certain conditions so their presence in a peat layer can be indicative of the climate during that time
- peat forms in layers so the the age of the peat layer can be tracked
- each species has its own specific pollen which allows scientists to identify which plant species were about
- certain plants only grow in certain conditions so their presence in a peat layer can be indicative of the climate during that time
- peat forms in layers so the the age of the peat layer can be tracked
- peat forms in layers so the the age of the peat layer can be tracked
- certain plants only grow in certain conditions so their presence in a peat layer can be indicative of the climate during that time
- each species has its own specific pollen which allows scientists to identify which plant species were about
- peat forms in layers so the the age of the peat layer can be tracked
- certain plants only grow in certain conditions so their presence in a peat layer can be indicative of the climate during that time
- Sources of Evidence for Climate Change
- Tree Ring - analysis
- trees produce a new layer of xylem vessels underneath the bark every year
- the diameter of the tree ring is indicative of the season that they were produced
- spring = big rings (due to this being the period where the tree grows the most)
- Winter/Autumn = little or no growth at all
- Summer = narrow rings
- samples can be taken by cutting the tree down and looking or by taking a core sample to work out the diameter of the tree rings
- the diameter of the tree ring is indicative of the season that they were produced
- Also called 'dendrochronology'
- trees produce a new layer of xylem vessels underneath the bark every year
- Tempreture records
- these are collected by the people who lived in the areas during the time
- less valid because the equipment used was less accurate since the people recording did not have todays developed technology
- Tree Ring - analysis
- these are patches of partially decayed organic matter
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