Snowball Earth

Snowball Earth or Icehouse Earth refers to times when the Earth's surface was nearly or entirely frozen. The occurrence of Snowball (or Slushball) Earths...

there many times the Earth was covered in ice sheets. (For example, the Cryogenian). This is called the Snowball Earth theory. Earth is rocky. It is the...

cooling of the global climate around 700 million years ago (the so-called Snowball Earth of the Cryogenian period) and the rapid evolution of primitive life...

severe and longest ice ages in geologic history. It was similar to the Snowball Earth ice ages that happened later, in the Neoproterozoic era. The glaciations...

Rodinia and at the end of a global ice age (Snowball Earth). Throughout the early Palaeozoic, the Earth's landmass was broken up into a substantial number...

the Earth had two great ice ages, the Sturtian and Marinoan glaciations. These ice ages were so severe they are sometimes called Snowball Earth. In the...

The well-identified events were: Several glaciations, including the Snowball Earth during the Cryogenian period in the late Neoproterozoic. Rapid crustal...

mya These two snowball earth events were previously put together as the Varangian glaciation. They covered much, possibly all, the Earth with ice. The...

longer period: it included the whole of the Marinoan glaciation, of Snowball Earth fame. In other words, the Vendian included the last part of the Cryogenian...

Kirschvink, Isaac A. Hilburn, and Cody Z. Nash (2005). "The Paleoproterozoic snowball Earth: A climate disaster triggered by the evolution of oxygenic photosynthesis"...

methane, and caused the Huronian glaciation. This was perhaps the longest snowball Earth episode ever. Free oxygen has been an important part of the atmosphere...

Ono, 2006 https://www.jstor.org/stable/20209693 The Palaeoproterozoic Snowball Earth: A climate disaster triggered by the evolution of oxygenic photosynthesis...

glaciation (~2400 mya Earth completely covered in ice probably due to Great Oxygenation Event) Later Neoproterozoic Snowball Earth (~600 mya, precursor...

populations crashed during the Cryogenian period 860 million years ago (the Snowball Earth episodes). They proliferated in the Cambrian explosion and reached their...

this has partly been responsible for the present temperature rise. Snowball Earth Ice core Milankovitch cycle Orbital forcing Pleistocene Glaciation Global...

another one start?". Robert E. Kopp; et al. (2005). "The Paleoproterozoic snowball Earth: a climate disaster triggered by the evolution of oxygenic photosynthesis"...

and the tail formed. These observations supported Fred Whipple's "dirty snowball" model. This correctly predicted that Halley would be composed of a mixture...

animal fossils 580 million years - time since the end of a possible Snowball Earth ice age 703.8 million years - half-life of uranium-235 750 million years...

that moves around in outer space. Comets are often described as "dirty snowballs". They are very different from asteroids. The orbital inclinations of...

such as Earth, and streams of debris from a comet. Comets are dirty snowballs, made up of rock embedded in ice, orbiting the Sun. Each time a comet...