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  2. Water cycle - Wikipedia

    en.wikipedia.org/wiki/Water_cycle

    The water cycle (or hydrologic cycle or hydrological cycle ), is a biogeochemical cycle that involves the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time. However, the partitioning of the water into the major reservoirs of ice, fresh water, salt water and ...

  3. List of largest lakes of the United States by volume - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_lakes_of...

    Created in 1941 by the impoundment of the Columbia River by the Grand Coulee Dam. 26. Cayuga Lake. New York. 7,672,000 acre⋅ft (9.5 km 3) 435 ft (133 m) second largest of the Finger Lakes. 27. Rainy Lake.

  4. List of largest reservoirs in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_reservoirs...

    Due to sedimentation and other factors that affect a reservoir's storage capacity over time, some data listed might not accurately reflect actual current conditions in certain reservoirs. For example, Lake Mead – the largest reservoir in the U.S. – could store more than 32.4 million acre-feet (40.1 km 3 ) when first filled, but sediment ...

  5. History of water supply and sanitation - Wikipedia

    en.wikipedia.org/wiki/History_of_water_supply...

    The history of water supply and sanitation is one of a logistical challenge to provide clean water and sanitation systems since the dawn of civilization. Where water resources, infrastructure or sanitation systems were insufficient, diseases spread and people fell sick or died prematurely. Astronaut Jack Lousma taking a shower in space, 1974.

  6. List of primary education systems by country - Wikipedia

    en.wikipedia.org/wiki/List_of_primary_education...

    Some schools may also introduce a third language in Class 6th or even in Class 5th. Sanskrit , French language and local state language are the most common third languages taught in Indian schools. At some places, primary education is labeled as the education of Class 3rd to Class 5th and up to class 2nd as pre-primary education.

  7. Second Industrial Revolution - Wikipedia

    en.wikipedia.org/wiki/Second_Industrial_Revolution

    The Second Industrial Revolution, also known as the Technological Revolution, [ 1] was a phase of rapid scientific discovery, standardisation, mass production and industrialisation from the late 19th century into the early 20th century. The First Industrial Revolution, which ended in the middle of the 19th century, was punctuated by a slowdown ...

  8. Water storage - Wikipedia

    en.wikipedia.org/wiki/Water_storage

    Water storage. Water storage is a broad term referring to storage of both potable water for consumption, and non potable water for use in agriculture. In both developing countries and some developed countries found in tropical climates, there is a need to store potable drinking water during the dry season. In agriculture water storage, water is ...

  9. Hydrology - Wikipedia

    en.wikipedia.org/wiki/Hydrology

    Rain over a Scottish catchment.Understanding the cycling of water into, through, and out of catchments is a key element of hydrology. Hydrology (from Ancient Greek ὕδωρ (húdōr) 'water' and -λογία () 'study of') is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and drainage basin ...