Question #351f9

1 Answer
Giorgio C.
Dec 28, 2017

Young basaltic rock

Explanation:

The Ocean floor is made mostly by basaltic rocks deriving from the cooling of the lava emitted from the middle oceanic ridges.

These ridges are chains of volcanoes characterized by a central fracture from which new lava is emitted and that hosts a number of geothermal vents.

The geothermal vents often are represented by chimneys of emitting ultra-heated water (up to 400 Celsius) and acidic sulfur-derived fluids. Endemic life-forms have been identified living in these vents.

Above the basaltic bedrock variable thickness of fine sediments are present.

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