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Underline the correct words in bold.
1 The Arctic Circle is an area which surrounds the North/South Pole.
2 If you put a piece of ice in a warm place, it will boil/ melt.
3 An oil spill is a type of environmental/historical disaster.
4 An ice cap is a thick layer of sand and soil/ice and snow which covers an area of land the whole year round.
5 If a pilot is having problems while flying a plane, he or she calls "Mayday/SOS!" over the radio.