Sentences with phrase «call snowball earth»

I am open to possibility of condition occurring on earth that one could call a snowball earth, but I not am convinced that there is a particularly time when there was one.

Jim Green: One of the things that we've uncovered is that, in Earth's past, [our planet has] gone through various stages, one of which we call Snowball Earth.

So perhaps Earth has been as cool a 15 C colder than present Earth, but what mean is don't think it's been more than 20 C cooler [or what I would characterize a Earth which could called a snowball Earth [rather simply what could associate with a colder glacial period].

Not exact matches

Many believe something like this happened 570 million years ago, when our planet may have been completely covered in ice — Snowball Earth, it's called.

One of the extreme events, which has mystified scientists for long, took place 717 million years ago and is called «snowball Earth» — the largest glaciation event in history during which the planet was covered almost entirely in ice.

Today Earth is a pretty temperate place, but about 700 million years ago ice covered the planet from pole to pole, in an extreme glaciation period often called «Snowball Earth.»

The last of these so - called «Snowball Earth» glaciations ended around 635 million years ago when complex life was just starting to develop.

Studies include Berner et al. (1983); Kasting and Ackerman (1986); for review, Crowley and North (1991); more recently, Hoffmann et al. (1998); the term «snowball Earth» was coined by Joseph Kirschvink Kirschvink (1992); earlier Manabe called it «White Earth» according to Gleick (1987), p. 332; for references and popular - level discussion, see Ward and Brownlee (2000).