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”.

Moving Sofa Problem - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP487
Moving Sofa Problem
Anechoic Chamber - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP367
Anechoic Chamber
Legislative Violence - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP513
Legislative Violence
Hyperart Thomasson - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP549
Hyperart Thomasson
Extelligence - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP594
Extelligence
Laser Pointer - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP063
Laser Pointer
Westbury White Horse - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP491
Westbury White Horse
Windblown Dogs - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP336
Windblown Dogs
The Decline of Western Civilization - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP396
The Decline of Western Civilization
Gondola Accident - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP239
Gondola Accident
Out-Of-Body Experience - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP371
Out-Of-Body Experience
Ice Hockey Goaltenders Masks - © Attention Deficit Disorder Prosthetic Memory Program
ADDPMP284
Ice Hockey Goaltenders Masks

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