Lump of the minerals on deep ocean floor

A high Fe, Mg volcanic rock that makes up the ocean floor isGroup of answer choicesbasaltshalelimestoneNo answer text provided.

In the depths of Earth's oceans, researchers have been puzzled by the discovery of extensive fields of hydrothermal vents that eject materials significantly different from the typical mid-ocean ridge basalt. One such discovery was the surprising prevalence of olivine-rich deposits in regions where the seafloor is predominantly composed of basaltic rock, a composition suggesting a mantle source rather than the typical crustal processes. A study led by Alex Rivera utilized a combination of deep-sea drilling data and advanced spectroscopic analysis to uncover that these olivine-rich deposits contain an unusually high content of silica. Given that the oceanic crust, formed primarily from basalt, generally has low silica levels, Rivera claims that ______15Mark for ReviewABCWhich choice most logically completes the text?Athe detection of high silica content in olivine-rich deposits challenges the current understanding of ocean floor geology and points towards a complex interaction between mantle processes and crust formation.Bthe variations in silica content observed in the ocean floor are likely attributable to differences in detection methods between drilling data and spectroscopic analysis.Cunderstanding the composition and formation processes of the oceanic crust through these olivine-rich deposits may provide insights into similar processes on other celestial bodies, such as Mars.Dthe formation of the oceanic crust is a uniform process, and the presence of olivine-rich deposits with high silica content is an anomaly that does not impact the overall understanding of oceanic crust formation.

What oceanic feature clearly proves that the seafloor spreads?Group of answer choicesvolcanoesmountain rangeabyssal plainrift valleytrench

The bottom of the ocean including the rocky floor and sediment that covers it is the _________ zone.eadab385b83c1bc9a69179810f7438ec.webm113 KB apelagic bphotic cbenthic dcontinental

50. What is a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle? deep-ocean trench rift valley subduction zone seafloor spreading