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27 Cards in this Set
- Front
- Back
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when was the big bang? |
13.8 bya |
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when did the first living cells appear? |
4.5 bya, precambrian eon |
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when did the first sea creatures appear? |
600 mya, precambrian eon |
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when did the first land plants appear? |
485 mya, Ordovician era |
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when did the first land animals appear? |
420 mya, Devonian era |
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when did the first humans appear? |
2.6 mya, quaternary era |
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cenozoic |
recent life |
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mesozoic |
middle life |
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paleozoic |
ancient life |
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quaternary |
we are around and ice ages come and go, starts 2.6 mya |
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when did dinosaurs become extinct? |
65.5 mya, cretaceous |
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when did humans come out of africa? |
60 tya |
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when did humans reach australia? |
50 tya |
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When did humans reach britain? |
40 tya |
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when did humans reach the bering land bridge? |
16 tya |
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when did humans reach north america? |
15 tya |
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when did humans reach south america? |
12 tya |
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how does climate change work? |
by trapping greenhouse gases and the sun's heat in the atmosphere. |
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what are the main greenhouse gases? |
water vapour, carbon dioxide, methane, ozone, nitrous oxide |
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what is climate change? |
a shift in earth's weather patterns and temperatures |
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what is the solar system? |
a part of the milky way that consists of eight planets that revolve around the sun |
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how long does earth take on a full rotation? |
24 hrs |
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how long does earth take to go fully around the sun once? |
1 yr |
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what is physical geography? |
the study of natural features of the earth's surface |
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what is human geography? |
the study of people in different places, looking at issues such as poverty, war, population, health etc |
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what is environmental geography? |
how humans affect the environment they live in, such as littering, pollution, deforestation etc |
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YAY!! |
YAY!! |
