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The lake is situated within the caldera of the Sete Cidades Massif, an ancient volcano built on various layers of ash, pyroclasts and trachyte and basaltic lavas.It is a stratovolcano constructed from alternating phases of explosive and effusive ejecta, from dominantly basaltic pre-caldera eruptions, a trachytic caldera-forming stage and a post-caldera stage consisting of alternating trachytic ...
U.S. civil and maritime uses of tidal data. A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights.
The northern flank, showing the rolling hills of the Inferior Complex near the parish of Santa Bárbara and the summit of Pico da Barrosa.. The outer caldera dates from between 30,000 and 45,000 years ago, and comprises an area 4 kilometres (2.5 mi) wide and 13 kilometres (8.1 mi) long outer caldera (corresponding to the Água de Pau Massif). [2]
By this time, the historian Father Gaspar Frutuoso noted in his tome Saudades da Terra the 100 homes existed in the community; a comparable size to the other centers on the island, but only half the size of Ponta Delgada (250), Vila Franca do Campo (200) or Ribeira Grande (200). In 1522 (April 11) Lagoa, the village, became the municipal seat ...
While the majority of Earth's surface is covered by oceans, those oceans make up just a small fraction of the mass of the planet. The mass of Earth's oceans is estimated to be 1.37 × 10 21 kg, which is 0.023% of the total mass of Earth, 6.0 × 10 24 kg.
However, Chile has an innovative system of means-tested subsidies that allows qualifying poor households to receive a subsidy administered by the municipalities to pay parts of their water and sanitation bills. Rural water systems receive a partial investment subsidy that is defined in the Ley del Subsidio al Agua Potable y Saneamiento. [29]
Sistema Ox Bel Ha (Spanish: sistema, lit. 'system', Yucatec Maya: ox bel ha, lit. 'Three Paths of Water'; short Ox Bel Ha) is a cave system in Quintana Roo, Mexico.It is the longest explored underwater cave in the world [3] and ranks second including dry caves.
A girl collects clean water from a communal water supply in Kawempe, Uganda.. Water supply is the provision of water by public utilities, commercial organisations, community endeavors or by individuals, usually via a system of pumps and pipes.