An early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to an early consequence of the release of oxygen gas by plant and bacterial photosynthesis was to cause iron in ocean water and terrestrial rocks to rust (oxidize) prevent the formation of an ozone layer change the atmosphere from oxidizing to reducing make it easier to maintain reduced molecules

The correct answer is option A

Cause iron in ocean water and terrestrial rocks to rust (oxidize)

Some 2.8 billion years ago, the only evidence of life was in the form of stromatolites and presence of some organic compound with high range of complexity. These complex compounds were prominent in the shale’s of that time. According to Olson, it is established that during those times phosysnthesis just started and the atmosphere of earth by that time was reductive and not oxidative due to which the rocks containing granules of Pyrites (a form of iron) and other minerals could be easily oxidized.  

As per the facts it is believed that the presence of oxygen (which was corrosive in nature) made these minerals in the rock to react with oxygen and produce oxidized and decomposed simpler form of these sedimentary rocks which later could be broken up into the sediment granules. The huge deposit of ferric oxide, which is insoluble in ocean water, represents the scenario where iron after getting oxidized became insoluble otherwise it would have got dissolved in the water. But since iron in its oxidative form is insoluble it precipitates out in the sea bed as iron rich sediment on the sea floor.  

Along with oxidizing the iron ore , the oxygen released as of photosynthesis proved to be a setback for the anaerobic organism . With later advents it was visualized that the pyruvate when combined with oxygen produced carbon dioxide and water. From here the aerobic form of respiration started and due to this transformation from anaerobic to aerobic respiration the amount of energy produced increased by ten times. Later on oxygen impacted the microbes and they evolved by producing a cell nucleus which could now cover up their exposed DNA. Along with nucleus, cytoplasm was also formed.  

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.