Lake Superior, Lake Michigan, Lake Huron, Lake Erie, and Lake Ontario, form the Great Lakes, straddling the United States and Canada to make up the largest group of freshwater lakes in the world. Collectively they contain 5,439 cubic miles of water (22,670 cubic km), or about 20% of all the earth's fresh water, and cover an area of 94,250 square miles (244,106 square km).
Camels are mammals known for their distinctive humped backs. Bactrian camels ( Camelus bactrianus ) have two humps, while dromedary camels ( Camelus dromedarius ) have one. These creatures' humps store fat deposits that they use as sustenance when external food and water sources are scarce. Their ability to metabolize stored food for prolonged periods of time makes them good pack animals.
A leprechaun is a mythological figure, a type of fairy originating from 8th century Irish folklore. Contemporary leprechauns are depicted as men, small in stature and wearing a green coat, a top hat, and buckled shoes. They are known to be solitary creatures, dedicating themselves to shoemaking. They are notoriously lucky, able to grant wishes and give away treasure, but they are also known to be mischievous creatures.
Citizens of most foreign countries must obtain a visa to enter the U.S. There are two general classifications of U.S. visas: nonimmigrant visas for temporary stays, and immigrant visas to live and work permanently in the U.S. Temporary Visitors: Nonimmigrant US Visas Temporary visitors to the U.S. must obtain a nonimmigrant visa.
Amedeo Avogadro (August 9, 1776-July 9, 1856) was an Italian scientist known for his research on gas volume, pressure, and temperature. He formulated the gas law known as Avogadro's law, which states that all gases, at the same temperature and pressure, have the same number of molecules per volume. Today, Avogadro is considered an important early figure in atomic theory.