04+Glossary

Antarctica Circle- Imaginary mapping line at latitude. Hannah **Blizzard- 1.** A storm with dry, diving snow, strong winds and intense cold. (Ash) 2. A heavy and prolonged snowstorm covering a wide area. (Ash) **Ice floes-** sheets of floating ice.(Kiara) **Transantarctic Mountains** - 2200km long range separates East from West. Although mainly snow and ice covered many peaks estimated to be approx 4000m high. Contains the dry valleys. (Aden) **Antarctica Circle**- Imaginary mapping line at latitude. Hannah **Isolate**: A person, group or thing that must be seperated for medical reasons. (:Emily **Pack Ice**: floating ice sheets formed when the ocean surface freezes over and large blocks are wedged and cmpacted together. (GUS) FAST ICE - Old sea ice (TORI)
 * Glossary**
 * Ice Sheet:** A glacier covering a large fraction of a continent (Elise)
 * Arête** - sharp rocky ridge caused by ice eroding sides of a mountain peakArete- sharp rocky ridge caused by ice eroding sides of a mountain peak (Sophie)
 * Nunatak**- A mountain peak which protrudes from an ice sheet (Jordyn)
 * Scree-** Loose rock piles formed from a ice expanding in cracks of mountains. :) Thomas
 * Penguins-** Flightless seabirds (Tayla)
 * Antarctic Bottom Water** - The coldest and densest water mass in the global oceans. Formed in particular places on the Antarctic continental shelf such as Weddell Sea and Ross Sea when surface water cools and becomes more dense and so sinks to the ocean floor. Once formed it tends to flow northwards hugging the seafloor. It can be traced into many ocean basins, including parts of the North Atlantic Ocean. (tegan)
 * atmosphere** - The gases that surround a planet. Earth's atmosphere consists of about 20% oxygen and 79% nitrogen with smaller amounts of other gases. "Atmosphere" is also used as a unit for the measurement of pressure. One atmosphere equals 14.7 pounds per square inch being the pressure due to the mass of the gases acting on the earth at sea level. (tegan)
 * sastugi**- ridges of snow formed on a snowfield by an action of wind.
 * Chasm** - a yawning fissure or deep cleft in the earth's surface. (Renae)
 * Ice-core- ** ice-coresare drilled for scientific study.They can show those atmospheric pollutants which were present at the time the ice fell as snow. (Hayden)
 * Frazil Ice: **A sub surface slush in early stages of ice formation. (Jemma Holdsworth)
 * Grease Ice: **it is an initial freezing of sea water at end of summer becomes a compacted surface layer with an oily sheen. (Jemma Holdsworth)

Glacier- an extended mass of ice formed from snow falling and accumulating over the years and moving very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of accumulation, as in continental glaciers (Alex)

**'Lolly' Ice:** The thickened state of sea water when it begins to crystalize during freezing (Isabelle) **Nunatak:** A large piece of rock sticking out from the surrounding ice (Isabelle) **Pack Ice:** Large sheets of free-floating sea ice (Isabelle)

pancake ice-newly formed ice in flat pieces too small and thin to obstruct navigation. Thalia

Crevasse~a deep cleft in glacial ice (Aly)

=Hypothermia: 1-subnormal body temperature. 2-the artificial reduction of bodytemperature to slow metabolic processes, as for facilitatingheart surgery. (Harrison). =