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The ozone hole is the thinning of the ozone layer over the Antarctic region. Various weather satellites have indicated that the overall percentage of ozone in the Antarctic and the Arctic ozone layer is actually decreasing at an alarming rate. Dobson Units Dobson units (DU) are the standard way to express ozone amounts in the atmosphere. • Ozone is a colorless gas. • Ozone smells something like burning electrical wiring. • French physicists Charles Fabry and Henri Buisson discovered the ozone layer in 1913.
Lakes are also formed by collapsing volcanic craters and the movement of tectonic plates in the earth’s crust. Lakes can be man-made too. Land of the Thousand Lakes Finland is known as the land of the thousand lakes. It has about 187,888 lakes. Great Lakes The Great Lakes are a group of five large lakes in North America: Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario. 38 • Subglacial lakes are lakes permanently covered by ice. • Artificial lakes are also called reservoirs.
8 feet. • Pandas are bear-like mammals that eat small invertebrates, mammals, and birds. • Tigers are the largest and most powerful living cat species in the world. • Lions usually hunt at night or dawn. • Wolves function as social predators and hunt in packs. • When hyenas hunt an animal that is bigger than themselves, they hunt in packs. • When hyenas hunt smaller prey, they hunt alone. Extinct Animals E xtinct animals are those animals that are no longer in existence. Extinction may be the result of natural causes or human interventions such as habitat destruction and hunting.