Sentences with phrase «after snowball earth»

Yang, J., M.F. Jansen, F.A. MacDonald, and D.S. Abbot (2017), Persistence of A Surface Freshwater Ocean After A Snowball Earth, Geology, 45 (7), 615 — 618.

This model does not, however, explain one of the most puzzling features of this rapid deglaciation; namely the global formation of hundreds of metres thick deposits known as «cap carbonates», in warm waters after Snowball Earth events.

Not exact matches

After an extreme ice age known as snowball Earth, in which glaciers extended to the tropics and ice up to a kilometre thick covered the oceans, the melted ice formed a thick freshwater layer that floated on the super-salty oceans.

There is evidence that Earth has gone through at least one globally frozen, «snowball» state in the last billion years, which it is thought to have exited after several million years because global ice - cover shut off the carbonate - silicate cycle, thereby allowing greenhouse gases to build up to sufficient concentration to melt the ice.

This chemical weathering process is too slow to damp out shorter - term fluctuations, and there are some complexities — glaciation can enhance the mechanical erosion that provides surface area for chemical weathering (some of which may be realized after a time delay — ie when the subsequent warming occurs — dramatically snow in a Snowball Earth scenario, where the frigid conditions essentially shut down all chemical weathering, allowing CO2 to build up to the point where it thaws the equatorial region, at which point runaway albedo feedback drives the Earth into a carbonic acid sauna, which ends via rapid carbonate rock formation), while lower sea level may increase the oxidation of organic C in sediments but also provide more land surface for erosion... etc..

«Then both before and after the arrival of an oxygen atmosphere, the planet went into partial or potentially total snowball periods — millions of years when the Earth's mean temperature was well below the freezing point.»

Global warming began its recovery after the last Snowball Earth, was halted a few times by the ice ages (big and little), and for the past 150 or so years has been slowly been returning to NORMAL.

The fact that they lucked out, after two billion years or so and a safe transition to the Phanerozoic (hey, what's a few Snowball Earths among friends?)

For instance, the first animal embryos show up after the end of the latest Snowball Earth event, around 635 million years ago.

After using World Earth Day to warn about the impact the changing climate is already having on the US, [Obama] used his annual stand - up routine in front of White House journalists to rant against his «stupid, short - sighted, irresponsible» climate skeptic opponents who throw snowballs in the Senate to illustrate global warming isn't happening.

Or, perhaps I should say, a snowball's chance on Earth after Monbiot's brave, well - researched, and ingenious ideas have been forgotten.

Before the cambrian explosion (nonterrestrian life) multicellular animal fossils are known only from Vendian which is after «snowball earth» times.

climatological) conditions during the time before snowball earth and after.