Angel Falls

Found in Venezuela, Angel Falls is known as the world’s highest water fall. Starting from the Auyantepui Mountain in the Canaima National Park, the falls droops down to a depth of 979m from the top into the Kerep River aka Río Gauya. Due to the vast amount of height, the water usually turns into mist before catching the bottom. First ever person to fly over the falls is the US aviator Jimmie Angel. The falls was named after him. Sir Walter Raleigh is regarded as the first European to view the Falls but some say it was Fernando de Berrio; a Spanish explorer. The first westerner to reach the river that nourishes the falls is Aleksandrs Laime, also known as Alejandro Laime to the native Pemon tribe from Latvia. His climb was in 1955. He gave this river feeding the falls the name Gauja after a river in Latvia, but the Pemon-given name of the river, Kerep, is still widely used.

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Niagara Falls

 Enchantingly magnificent in sight, Niagara Falls can be categorized as the most beautiful and powerful waterfall in the world. Located on the Niagara River in North America, it is 17 miles (27 km) north-northwest of Buffalo, New York and 75 miles (121 km) south-southeast of Toronto, between the twin cities of Niagara Falls, Ontario, and Niagara Falls, New York. The falls is composed of two parts separated by Goat Island: the Horseshoe Falls on the Canadian side and the American Falls on the American side. The smaller Bridal Veil Falls are also located on the American side, separated from the main falls by Luna Island. The international boundary line was originally drawn through Horseshoe Falls in 1819, but the boundary has long been in dispute due to natural erosion and construction.

Niagara Falls were formed when glaciers receded at the end of the Wisconsin glaciation (the last ice age), and water from the newly formed Great Lakes carved a path through the Niagara Escarpment en route to the Atlantic Ocean. While not exceptionally high, the Niagara Falls is very wide. More than 6 million cubic feet (168,000 m3) of waterfalls over the crest line every minute in high flow, and almost 4 million cubic feet (110,000 m3) on average. When the ice melted, the upper Great Lakes emptied into the Niagara River, which followed the rearranged topography across the Niagara Escarpment. In time, the river cut a gorge through the north facing cliff, or cuesta. Because of the interactions of three major rock formations, the rocky bed did not erode evenly. The top rock formation was composed of erosion resistant limestone and Lockport dolostone. That hard layer of stone eroded more slowly than the underlying materials. The aerial photo on the right clearly shows the hard caprock, the Lockport Formation (Middle Silurian), which underlies the rapids above the falls, and approximately the upper third of the high gorge wall.

Immediately below the hard-rock formation, comprising about two thirds of the cliff, laid the weaker, softer, sloping Rochester Formation (Lower Silurian). This formation was composed mainly of shale, though it has some thin limestone layers. It also contains ancient fossils. In time, the river eroded the soft layer that supported the hard layers, undercutting the hard cap rock, which gave way in great chunks. This process repeated countless times, eventually carving out the falls. Submerged in the river in the lower valley, hidden from view, is the Queenston Formation (Upper Ordovician), which is composed of shales and fine sandstones. All three formations were laid down in an ancient sea, their differences of character deriving from changing conditions within that sea.

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Victoria Falls… The Smoke That Thunders….

Located in southern Africa on the Zambezi River between the countries of Zambia and Zimbabwe, this beautiful waterfall is also the known to be the largest in the world. This was found by a Scottish explorer; David Livingstone who gave the name for this falls in honour of his queen. However, the indigenous name of this waterfall is 'Mosi-oa-Tunya' — literally meaning the 'Smoke that Thunders'. While it is neither the highest nor the widest waterfall in the world, it is claimed to be the largest. This claim is based on a width of 1,708 metres (5,604 ft) and height of 108 metres (354 ft), forming the largest sheet of falling water in the world. Victoria Falls and the adjoining parklands were collectively designated a World Heritage site in 1989.

The falls are formed as the full width of the river plummets in a single vertical drop into a transverse chasm 1708 meters (5604 ft) wide, carved by its waters along a fracture zone in the basalt plateau. The depth of the chasm, called the First Gorge, varies from 80 metres (260 ft) at its western end to 108 metres (354 ft) in the centre. The only outlet to the First Gorge is a 110 metres (360 ft) wide gap about two-thirds of the way across the width of the falls from the western end, through which the whole volume of the river pours into the Victoria Falls gorges. There are two islands on the crest of the falls that are large enough to divide the curtain of water even at full flood: Boaruka Island (or Cataract Island) near the western bank, and Livingstone Island near the middle — the place that David Livingstone first saw the falls from in Zambia. At less than full flood, additional islets divide the curtain of water into separate parallel streams. The main streams are named, in order from Zimbabwe (west) to Zambia (east): Devil's Cataract (called Leaping Water by some), Main Falls, Rainbow Falls (the highest) and the Eastern Cataract.

At full moon, a "moonbow" can be seen in the spray instead of the usual daylight rainbow. During the flood season, however, it is impossible to see the foot of the falls and most of its face, and the walks along the cliff opposite it are in a constant shower and shrouded in mist. Close to the edge of the cliff, spray shoots upward like inverted rain, especially at Zambia's Knife-Edge Bridge. As the dry season takes effect, the islets on the crest become wider and more numerous, and in September to January up to half of the rocky face of the falls may become dry and the bottom of the First Gorge can be seen along most of its length. At this time it becomes possible to walk across some stretches of the river at the crest. It is also possible to walk to the bottom of the First Gorge at the Zimbabwean side. The minimum flow, which occurs in November, is around a tenth of the April figure; this variation in flow is greater than that of other major falls, and causes Victoria Falls' annual average flow rate to be lower than might be expected based on the maximum flow.

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