Monthly Archives: May 2015

Tufa is a variety of limestone, formed by the precipitation of carbonate minerals from ambient temperature water bodies. Geothermally heated hot-springs sometimes produce similar (but less porous) carbonate deposits known as travertine. Tufa is sometimes referred to as (meteogene) travertine; care must be taken when searching through literature to prevent confusion with hot spring (thermogene) travertine. Calcareous tufa should not be confused with tuff, a porous volcanic rock with parallel etymological origins that is sometimes called “tufa”.

Pyramid Lake is the geographic sink of the Truckee River Basin, 40 mi (64 km) northeast of Reno.

Pyramid Lake is fed by the Truckee River, which is mostly the outflow from Lake Tahoe. The Truckee River enters Pyramid Lake at its southern end. Pyramid Lake has no outlet, with water leaving only by evaporation, or sub-surface seepage (an endorheic lake). The lake has about 10% of the area of the Great Salt Lake, but it has about 25% more volume. The salinity is approximately 1/6 that of sea water. Although clear Lake Tahoe forms the headwaters that drain to Pyramid Lake, the Truckee River delivers more turbid waters to Pyramid Lake after traversing the steep Sierra terrain and collecting moderately high silt-loaded surface runoff.

Tufa Formations, Pyramid Lake, Nevada

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Chuuk Lagoon, also known as Truk Lagoon, is a sheltered body of water in the central Pacific. About 1800 km north-east of New Guinea, it is located mid-ocean at 7 degrees North latitude, and is part of Chuuk State within the Federated States of Micronesia. The atoll consists of a protective reef, 225 kilometres (140 mi) around, enclosing a natural harbour 79 by 50 kilometres (49 by 30 mi), with an area of 2,130 square kilometres (820 sq mi).It has a land area of 127.4 square kilometres (49.2 sq mi), with a population of 34,651 people.

Truk, Micronesia

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