Ice
eon
era
period
epoch
the ice age was a period of time when the earths climate was cooler and ice sheets expanded to cover a lot of the earth
interglacials are warmer times when the ice sheets melt and oceans get larger
Evidence
the Southern UK wasn't covered so much in ice as the temperature was warmer so there was no permanent ice
there was more ice in the N.Hemishpere as there is more land and most of S.Hemisphere is sea
ice forms at higher peaks in anomalies e.g Himilayas
landforms
fossil evidence
scientific ice cores
scriations of rocks, drumlins, ground moraine, erratics
mammoth fossils in sea, hippo fossils (evidence of interglacials)
variation of oxygen-18 atoms that show 'history' of ice ie. glacials and interglacials from over 1000 years ago
glacier?
develop where snow has once fallen, the weight of the ice means that it slowly slips down the mountain
glacial budget
accumulation - inputs
ablation - outputs
is glacial budget is a positive number, accumulation is more than ablation (longer, deeper, advancing)
is glacial budget is negative number, ablation is more than accumulation (shorter, shallower, retreating)