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Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur ...
Hurricane Opal was a large and powerful tropical cyclone that caused severe and extensive damage along the northern Gulf Coast of the United States in October 1995. The fifteenth named storm, ninth hurricane and strongest tropical cyclone of the unusually active 1995 Atlantic hurricane season, Opal developed from the interaction of a tropical wave and a low-pressure area near the Yucatán ...
Hurricane Cesar was the deadliest hurricane to hit Costa Rica. December 5–12, 1887 – Tropical Storm Nineteen made landfall in Costa Rica. [4] October 8–10, 1906 – A hurricane formed near Costa Rica, causing damage to fruit plantations. Total damage was recorded at $1 million (1906 USD), though no deaths were reported. [5]
Get the Queretaro, QT local weather forecast by the hour and the next 10 days. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways ...
143928. Website. sanjuandelrio.gob.mx. San Juan del Río is a city (2010 census pop. 241,699) and administration of the surrounding San Juan del Río Municipality (pop. 208,462) in the central Mexican state of Querétaro. The population in for the municipality is 268,408 as of 2015. The city and its municipality have the second-highest ...
Costa Rican Central Valley. The Central Valley (Spanish: Valle Central) is a plateau and a geographic region of central Costa Rica. The land in the valley is a relative plain, despite being surrounded by several mountains and volcanoes, the latter part of the Central Range. The region houses almost three quarters of Costa Ricans, and includes ...
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Traditional metal working in Mexico dates from the Mesoamerican period with metals such as gold, silver and copper. Other metals were mined and worked starting in the colonial period. The working of gold and silver, especially for jewelry, initially declined after the Spanish conquest of the Aztec Empire. However, during the colonial period ...