Search results
Results from the WOW.Com Content Network
Marine sediment, or ocean sediment, or seafloor sediment, are deposits of insoluble particles that have accumulated on the seafloor.These particles either have their origins in soil and rocks and have been transported from the land to the sea, mainly by rivers but also by dust carried by wind and by the flow of glaciers into the sea, or they are biogenic deposits from marine organisms or from ...
An ophiolite is a section of Earth's oceanic crust and the underlying upper mantle that has been uplifted and exposed, and often emplaced onto continental crustal rocks. The Greek word ὄφις, ophis (snake) is found in the name of ophiolites, because of the superficial texture of some of them. Serpentinite especially evokes a snakeskin.
A stack or sea stack is a geological landform consisting of a steep and often vertical column or columns of rock in the sea near a coast, formed by wave erosion. [1] Stacks are formed over time by wind and water, processes of coastal geomorphology. [ 2 ]
Siliceous oozes accumulate over long timescales. In the open ocean, siliceous ooze accumulates at a rate of approximately 0.01 mol Si m −2 yr −1. [6] The fastest accumulation rates of siliceous ooze occur in the deep waters of the Southern Ocean (0.1 mol Si m −2 yr −1) where biogenic silica production and export is greatest. [7]
A simplified map showing the geology of the Lizard peninsula, Cornwall The Lizard complex is Britain 's most complete [ 7 ] example of an ophiolite . Much of the peninsula consists of the dark green and red rock, serpentinite , which forms cliffs as at Kynance Cove , and can be carved and polished to create ornaments.
The platform forms an escarpment between the Gulf of Mexico and the Atlantic Ocean. The platform's western edge, or Florida Escarpment, is normally defined where water depths at 300 feet (91 m) drop dramatically and in a short distance to 10,000 feet (3,000 m). The Florida peninsula is located on the eastern side of the platform, where in ...
Biodetrital sand, leftover from shell debris, is found along the coast of Madeira, in places where the sea level subsequently retreated. In fact, uplift of the island combined with changes in sea level related to the end of the Pleistocene ice ages means that some Quaternary marine terraces are as much as 100 meters above sea level. [4]
Svecofennian migmatite rock outcrop on the island of Berghamn in the municipality of Pargas at the southwestern tip of Finland. The lighter parts of the outcrop are granite and the darker parts are mica schist. The southwestern part of Finland is mainly made up of rocks of the Svecofennian Domain or Svecofennian orogen. [10]