Attention Deficit Disorder Prosthetic Memory Program

Snowball Earth

ADDPMP501
Snowball Earth - © Attention Deficit Disorder Prosthetic Memory Program

The Snowball Earth hypothesis proposes that during one or more of Earth’s icehouse climates, Earth’s surface became entirely or nearly entirely frozen, sometime earlier than 650 Mya (million years ago) during the Cryogenian period. Proponents of the hypothesis argue that it best explains sedimentary deposits generally regarded as of glacial origin at tropical palaeolatitudes and other enigmatic features in the geological record. Opponents of the hypothesis contest the implications of the geological evidence for global glaciation and the geophysical feasibility of an ice- or slush-covered ocean and emphasize the difficulty of escaping an all-frozen condition. A number of unanswered questions remain, including whether the Earth was a full snowball, or a “slushball” with a thin equatorial band of open (or seasonally open) water.

The snowball-Earth episodes are proposed to have occurred before the sudden radiation of multicellular bioforms known as the Cambrian explosion. The most recent snowball episode may have triggered the evolution of multicellularity. Another, much earlier and longer snowball episode, the Huronian glaciation, which would have occurred 2400 to 2100 Mya, may have been triggered by the first appearance of oxygen in the atmosphere, the “Great Oxygenation Event”.

Dhampir - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP218
Dhampir
Sports Bloopers - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP261
Sports Bloopers
Elementi di semiologia - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP069
Elementi di semiologia
World's First Photograph - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP365
World's First Photograph
Xenu - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP465
Xenu
Meltwater Channel - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP316
Meltwater Channel
4'33" - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP085
4'33"
Hydra-Shok - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP142
Hydra-Shok
Large Hadron Collider - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP319
Large Hadron Collider
Anechoic Chamber - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP367
Anechoic Chamber
Me At The Zoo - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP159
Me At The Zoo
Conspiracy 58 - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP495
Conspiracy 58

You are using an outdated browser.
Please upgrade your browser to improve your experience.