Arctic Circle - The polar circle located in the nothern hemispere. , high latitude - Part of the Earth's surface that is far from the equator (over 60°)., isotherm - Imaginary line that connects places with the same temprature. , land ice - A layer of perpetual snow that has been turned into a thick sheet of ice. , permafrost - Ground that is always frozen. , perpetual snow - Snow that never melts. , population density - The average number of people per square kilometre (km²)., sea ice - Frozen seawater (drift ice/pack ice)., taiga - Part of the temperate zone where coniferous forests grow. The average temprerature in winter is lower than -3°C. Also known as coniferous forest zone. , tree line - Imaginary line dividing an area with trees from an area that is to cold for trees to grow (colder than 10°C in summer0., tundra - Treeless area in polar regions where the only vegetation is grass, moss and low shrubs. , circle of latitude - Imagenary circle that connects places with the same latitude. , climate zone - Temperature zone on Earth. The three major climate zones are tropical, temperate and polar. , coniferous forest zone - Part of the temperate zone where coniferous forests grow. The average temprerature in winter is lower than -3°C. Also known as taiga., deciduous forest zone - Area within the temperate zone that contains deciduous trees, such as oaks and beeches. , hetrogeneous forest - Forest where both deciduous and coniferous trees grow. It is located between the taiga and deciduous zones., low latitude - Part of the Earth's surface that is near the equator (less than 30°)., polar circles - Circles of latitude at 66 ½°N (Arctic circle) and 66 ½°S (Antarctic circle)., polar regions - Areas north of 66 ½°N and south 66 ½°S., Tropic of Cancer - Two lines of latitude located at 23½°N and 23½°S, marking the nothern and southern boundaries of the tropical zones. , Tropic of Capricorn - Two lines of latitude located at 23½°N and 23½°S, marking the nothern and southern boundaries of the tropical zones., tropics - Warm climate zon near the equator between 23½°N and 23½°S.,

Chapter 2, section 3

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