Lesson 02: Plate Tectonics in the News
"Odd New Theory Explains How Early Earth Got Its Oxygen" Cyanobacteria diagram from https://en.wikipedia.org/wiki/Cyanobacteri a Oxygen production on Earth is theorized to have started about 2.5 billion years ago by oceanic cyanobacteria. These cyanobacteria produced oxygen as a product of photosynthesis. At around 2.3 billion years ago, an environmental change occurred, called the Great Oxygenation Event (GOE). At this point, the oxygen sinks on Earth became saturated, so oxygen produced by these cyanobacteria was free to go into the atmosphere. But what happened during that in between period? There are many theories that explain what happened in that time lag in between the beginning of oxygen production and the GOE. A more recent one is addressed in the news article I found. Convergent Boundary from https://geomaps.wr.usgs.gov/parks/pltec/converge.html According to a news article on Live Science, a new study by Megan Duncan and Rajdeep Dasgupta at Rice...