Old exams Flashcards
Glossopteris
fern trees found on mount wild showing that Antartica went through two tundra like warming periods and showing prof of plate tectonics
Circumpolar deepwater
dense cold highly saline water circulating the globe at bottom of ocean. travels around globe and rises to subsurface in Antartica warming on way up to cause open ocean polynias
gondwana
southern supercontinent (warming period cause oceans to become very acidic possibly causing marine loss, lots of vegetation) 550 mya
glacial striations
as glaciers move over rock it smooths and polishes it. from these you can determine which way glaciers was moving
sedimentary rocks
created from layers of rock sodlidifying toeheter like sandstone significant because preserves fossils
antarctic bottom water
this is deep dense cold and very saline water that sinks from sea ice. significant because causes circumpolar deep water.
solar insolation
this is how the suns radiation enters the surface and then is reflected or absorbed as inferred but then is trapped by the ozone layer. keeps earth at a habitable temperatre/climate
ozone hole
found over antarica due to OFC’s bonding with NO2 ice crystals then melting and breaking down in Cl which destroys O3. ozone thinking has lasting impact on climate
isostatic uplift
this is how the weight of the ice pushes down on the continent then as glaciers melt the island rises. significant because this can be seen in beaches where water was is now and offers inside to global warming and its affects on sea level.
Sastrugis
rides of snow formed parallel to wind direction
Halley station
site of longest record of atmosphere ozone levels
ice rafted debris
sediment deposited in ocean from melting ice bergs
rodinia
one of the earliest “supercontinents” known
Larson B Ice shelf
Underwent rapid collapse in 2002 from warming trend
fast ice
sea ice connected to land
ventifacts
rocks carved by the wind
moulin
a melt holes in glaciers that help drain water
bipolar sea saw
arctic and antarctic follow opposite climate trends
saltation
process by which pits from in rocks from winds
terminal moraine
ridge of dirt and rock formed at from too a glacier
astenosphere
molto rock in earth that causes plate tectonics
mauna loa
site of longest atmospheric CO2 record since 1950’s
Nothofagus
fossil fern tree linking South America with antartica
ice tongue
glacial extension that moves rapidly out to sea