Evolution Message Board - Msg: 29021898

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Politics : Evolution

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next

To: Brumar89 who wrote (39484)	7/25/2013 12:45:07 AM
From: 2MAR$	Read Replies (1) of 69300

Today, geologists recognize that the rates of geological processes have varied considerably through the history of Earth and that many processes have operated in the past that may not be readily studied today. Exactly , whats more the changing conditions in the ocean's composition with the great oxygen cycle that starts about 2.4Bil yrs ago then accummulates & builds right up to 850mil yrs ago would be a major influence for rapid change. The atmosphere goes from practically no free oxygen present to rising levels much higher approaching up into the Cambrian. Surprise surprise, we see no discussion of this? en.wikipedia.org O2 build-up in the Earth's atmosphere. Red and green lines represent the range of the estimates while time is measured in billions of years ago (Ga). Stage 1 (3.85–2.45 Ga): Practically no O2 in the atmosphere. Stage 2 (2.45–1.85 Ga): O2 produced, but absorbed in oceans & seabed rock. Stage 3 (1.85–0.85 Ga): O2 starts to gas out of the oceans, but is absorbed by land surfaces. Stages 4 & 5 (0.85–present): O2 sinks filled and the gas accumulates. [1]

Report TOU Violation

Share This Post

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next