4.1 & 2 evidence and causes for climate change Flashcards
quaternary period
the recent period of geological time
glacial period
a period of ice
interglacial period
A period of warmer temperatures between two ice ages.
ice cores
cores of ice have bubbles of gases trapped inside, scientists can find out what type of temperature it was each year
how do tree rings contribute to climate change
tree rings form every year, they are thick in warm and wet conditions, the thickness of each ring determines what climate it was like
how does pollen analysis contribute to climate change
pollen preserved from plants can be compared with similar plants, this shows that climates were similar
NATURAL AND HUMAN CAUSES
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orbital changes
they effect how much solar radiation we get the more their is, the more warmer it will be
stretch
orbit change in shape from circular to an oval shape
tilt
earth axis tilt as it orbits the sun
wobble
earth axis wobble as it orbits the sun
volcanic eruption
releases material to the atmosphere, blocks the sun so it is cooler
how does solar output contribute to climate change
the less solar output their is, the more cooler it will be
what is global warming
a gradual increase in average global temperature
what is the greenhouse effect
greenhouse gases heat the earth
