Question #351f9

1 Answer
Dec 28, 2017

Young basaltic rock


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.