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what is the compound that limestone is made up of?
calcium carbonate
when limestone is exposed to more heat and pressure it forms a metamorphic rock known as what?
marble
weathering
the wearing away of rocks
erosion
the movement of rocks away from the site they were weathered from
fossil fuels
fuels made from the decay of the remains of plants and animals which died millions of years ago, eg coal, oil and natural gas
global warming
the rise in temperature of the earth's atmosphere
greenhouse gases
gases in the atmosphere which absorb infra-red radiation (e.g. water vapour, carbon dioxide, methane and ozone)
How can you tell how old a tree is?
By measuring its diameter, or counting the number of rings
Which stores more carbon, a larger or a smaller tree?
a larger tree
Are diamonds more or less dense than water?
more dense
Name the two processes that remove carbon dioxide from the atmosphere
photosynthesis by plants and trees and dissolving in the sea