Exam 9: Precambrian Earth and Life History the Proterozoic Eon

The increase in atmospheric oxygen during the Proterozoic was caused by ____.

Discuss the suite of sedimentary rocks that forms on a passive margin with increasing distance and water depth from the shoreline.

Passive margin deposits are rare or absent during the Proterozoic and thereafter.

The next step in the Wilson cycle for the Atlantic ocean is ____.

The boundary between the Archean and Proterozoic is marked by changes in ____.

The primary source for free oxygen introduced into the atmosphere during the Proterozoic was through photosynthesis.

At the beginning of the Proterozoic, Earth's atmosphere was mostly ____.

What is a supercontinent? Identify the supercontinents of the Proterozoic. Discuss their history.

Eukaryotic cells likely originated from the ____________________ of prokaryotic cells.

During the Grenville orogeny, an ocean basin along the eastern margin of North America was closed.