This is balanced over time by the uptake of oxygen at mid ocean ridges, oxidising Fe2 + to Fe3 +, and the release of reduced carbon species from the same; it appears that around 2.5 billion years ago, this process sufficiently oxidised the mantle to that carbon dioxide became the dominant volcanic carbon species, thus reducing O2 drawdown and hence allowing atmospheric oxygen accumulation. (realclimate.org)
One day you may be standing in awe of age old Aboriginal rock painting, and the next be witness to the vast and impressive tidal changes at Montgomery Reef as the tide drops 40 feet in mid ocean trapped waters spill grandly over the edge of the exposed reef. (wikiaustralia.com)
John Newton a captain on a slave ship, transformed by prayer and prayer alone mid ocean in the very act of transporting human cargo. (religion.blogs.cnn.com)