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5 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Dendrochronology |
Analysis of fossilised tree rings. Each years growth shown by ring made of two bands: wide showing rapid growth in spring and narrower band showing growth in autumn. Wide ring: wet Narrow: cold,dry |
Tree |
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Radiocarbon dating |
C14radioactive isotope used by plants decays at a know rate. When a plant has died you can compare how much the carbon had decayed compared to C12 that does not decay Type of plant indicates climate during time period |
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Historical records |
Cave paintings, grace digging depth in Greenland, diary records of Thames freezing, growing grapes in U.K, weather reports since 1873 |
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Changing sea levels |
Rias, fjords, raised beaches and river rejuvenation |
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Oxygen isotopes |
cold=less evaporation.LIGHTER oxygen16 will precipitate and end up in ice sheets and glaciers. Oceans left with higher levels of oxygen18. warm=glaciers will melt into oceans so isotope levels more balanced |
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