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One acre equals 1 ⁄ 640 (0.0015625) square mile, 4,840 square yards, 43,560 square feet, [2] or about 4,047 square metres (0.4047 hectares) (see below).While all modern variants of the acre contain 4,840 square yards, there are alternative definitions of a yard, so the exact size of an acre depends upon the particular yard on which it is based.
This is a list of places on land below mean sea level. Places artificially created such as tunnels, mines, basements, and dug holes, or places under water, or existing temporarily as a result of ebbing of sea tide etc., are not included.
The hadal zone, also known as the hadopelagic zone, is the deepest region of the ocean, lying within oceanic trenches.The hadal zone ranges from around 6 to 11 km (3.7 to 6.8 mi; 20,000 to 36,000 ft) below sea level, and exists in long, narrow, topographic V-shaped depressions.
Its volume is 119,349,000 m³ and the area of its opening is 274,000 m 2. This material has been dissolved and carried away by the river. The sinkhole is a doubly nested structure—the upper bowl is 320 meters (1,050 feet) deep, the lower bowl is 342 meters (1,122 feet) deep, and the two bowls are on average 257 to 268 m (843 to 879 ft) across.
At 72.24 m (237.0 ft) deep and with a volume of 0.9390 km 3 (761,300 acre⋅ft), [2] Green Lake is the deepest natural inland lake in the state and second-largest by volume. [13] Only Lake Wazee, a man-made lake, is deeper, and only Lake Winnebago has a larger volume. The deepest and steepest part of the basin is near the west end, while the ...
Parker Dam is a concrete arch-gravity dam that crosses the Colorado River 155 miles (249 km) downstream of Hoover Dam.Built between 1934 and 1938 by the Bureau of Reclamation, it is 320 feet (98 m) high, 235 feet (72 m) of which are below the riverbed (the deep excavation was necessary in order to reach the bedrock on which the foundation of the dam was built), [1] [2] making it the deepest ...
At a surface elevation of 6,743 ft (2,055 m) above sea level, it has an east–west length of approximately seven miles (11 km) and is approximately 2.5 miles (4.0 km) at its widest measurement, though the lake's width mostly averages a little more than 1 ⁄ 2 mi (0.8 km). [1]
Despite the name, the deepest of its three sinkholes is 90 feet (27 m) deep. [3] [4] Lea Lake is the only lake in which swimming is allowed. It has a beach and concession area that is popular in the summer. Devil's Inkwell is the smallest lake with a surface area of 0.36 acres (0.15 ha).