There are 41 million acres of lakes and reservoirs in the U.S.There are at least 3 million lakes in Canada. The Great Lakes shoreline is equal to almost 44 percent of the circumference of the earth, and Michigan's Great Lakes coast totals 3,288...

The greatest and longest cave system in the world is at Mammoth Cave Park in Kentucky, USA. It has about 591 kilometers (367 miles) of cave system. Deepest cave is Voronya Cave in Abkhazia, Georgia with a depth of 2,191 meters. This is the difference...

There are five basic kinds of mountains: fold Mountains (folded mountains) , fault-block mountains (block mountains), dome mountains, volcanic mountains, plateau mountains . The world's highest peak on land is Mount Everest in the Himalayas. It is...

Niagara Falls is the second largest waterfall on Earth, the first being Victoria Falls in South Africa. Over 5,000,000,000 gallons (about 2 trillion liters) of water per hour flowed over the edge of Niagara Falls. The number of tourists visiting...

Four-fifths of Africa, the world's second largest continent, is made up of desert and grasslands. Less than a fifth is forest, and because of population growth, it is less forested every day. At the north edge of Africa is the vast Sahara, the...

The name "volcano" has its origin from the name of Vulcan, a god of fire in Roman mythology. Earth has more than 1,500 active volcanoes. The largest volcano in the world is Mauna Loa. It has a volume of about 40,000 cubic kilometers, and an...