hoover dam

Hoover Dam once known as Boulder Dam is a concrete arch gravity dam in the Black Canyon of the Colorado River on the border between the U.S. states of Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on September 30 1935 by President Franklin D. Roosevelt.

At the turn of the 20th century, farmers sought to divert the Colorado River to budding Southwestern communities via a series of canals.

When the Colorado broke through the canals in 1905, creating the inland Salton Sea, the job of controlling the raging river fell to the U.S. Bureau of Reclamation.

the Aswan high dam

The Aswan Dam is an embankment dam built across the Nile at Aswan Egypt between 1898 and 1902. Since the 1960s the name commonly refers to the Aswan High Dam. Construction of the High Dam became a key objective of the Egyptian Government following the Egyptian Revolution of 1952 as the ability to control floods provide water for irrigation and generate hydroelectricity were seen as pivotal to Egypt's industrialization. 

The High Dam was constructed between 1960 and 1970, and has had a significant effect on the economy and culture of Egypt.

Aswan High Dam is a rock-fill dam located at the northern border between Egypt and Sudan. The dam is fed by the River Nile's waters, and the reservoir created by the dam forms Lake Nasser.

The dam's construction began in 1960 and was completed in 1968. It was, however, officially inaugurated in 1971. The total investment for constructing the dam reached $1 billion

With a reservoir capacity of 132 cubic kilometers, the Aswan High Dam provides water for about 33,600km of irrigation land. It serves the irrigation needs of both Egypt and Sudan, controls flooding, generates power and helps in improving navigation across the Nile.

Erie canal

New York legislators became interested in the possibility of building a canal across New York in the first decade of the 19th century. Shipping goods west from Albany was a costly and tedious affair; there was no railroad yet, and to cover the distance from Buffalo to New York City by stagecoach took two weeks.

The Erie Canal is a canal in New York that is part of the east-west cross-state route of the New York State Canal System After a later conversion became known as the New York State Barge Canal. Originally it ran about 363 miles 584 km from Albany on the Hudson River to Buffalo at Lake Erie. It was built to create a navigable water route from New York City and the Atlantic Ocean to the Great Lakes.

First proposed in the 1780s re proposed in 1807 a survey was authorized and funded executed in 1808. Proponents of the project gradually wore down opponents its construction began in 1817. The canal has 36 locks and an elevation differential of about 565 feet 172 m. It opened on October 26 1825.

the ring of fire

The Ring of Fire is a major area in the basin of the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur. In a 40,000 km 25,000 mi horseshoe shape it is associated with a nearly continuous series of oceanic trenches volcanic arcs, and volcanic belts and or plate movements. It has 452 volcanoes more than 75% of the world's active and dormant volcanoes.1 The Ring of Fire is sometimes called the cir cum Pacific belt.

About 90%[2] of the world's earthquakes and 81 3 of the world's largest earthquakes occur along the Ring of Fire. The next most seismically active region 5–6 of earthquakes and 17% of the world's largest earthquakes is the Alpine belt, which extends from Java to the northern Atlantic Ocean via the Himalayas and southern Europe.4

All but 3 of the worlds 25 largest volcanic eruptions of the last 11,700 years occurred at volcanoes in the Ring of Fire.

The Ring of Fire is a direct result of plate tectonics: the movement and collisions of lithosphere plates.7 The eastern section of the ring is the result of the Nazca Plate and the Cocos Plate being subducted beneath the westward moving South American Plate.

monsoons

the seasonal wind of the Indian Ocean and southern Asia blowing from the southwest in summer and from the northeast in winter. 2. in India and nearby lands the season during which the southwest monsoon blows commonly marked by heavy rains 

Monsoon; is traditionally defined as a seasonal reversing wind accompanied by corresponding changes in precipitation,[1] but is now used to describe seasonal changes in atmospheric circulation and precipitation associated with the asymmetric heating of land and sea.2 3 Usually the term monsoon is used to refer to the rainy phase of a seasonally changing pattern, although technically there is also a dry phase. The term is sometimes incorrectly used for locally heavy but short-term rains,4 although these rains meet the dictionary definition of monsoon.

The major monsoon systems of the world consist of the West African and Asia Australian monsoons. The inclusion of the North and South American monsoons with incomplete wind reversal has been debated.

Strengthening of the Asian monsoon has been linked to the uplift of the Tibetan Plateau after the collision of the Indian sub continent and Asia around 50 million years ago.11 Because of studies of records from the Arabian Sea and that of the wind-blown dust in the Loews Plateau of China, many geologists believe the monsoon first became strong around 8 million years ago. 

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Public - 10/10/16, 4:49 PM