Loading
Close
stagevu

Hide

Login

Don't remember me (shared computer)
Recover account/Reactivate
 
Hide

pirsa org C04001 126 Death of the Dinos Giant Impacts and Biological Crises wmv

Thumbnail: click to play
Direct download link (.avi file). Can't watch this? Download the DivX Plus Web Player for Windows or for Mac! Not working? Troubleshoot!
This video is rated:
33300
Rate this video:
12345
Share
Favourite
Report
Add to Channel

Added September 3, 2010Video Info

By:bill99201
Category:Educational
Length:73:28
Resolution:480 x 320
Filesize:362 MB
Language:English
Viewed:166 times

Sixty-five million years ago dinosaurs ruled the warm Cretaceous Earth. Without warning, this world ...Sixty-five million years ago dinosaurs ruled the warm Cretaceous Earth. Without warning, this world was swept away forever by the impact of an asteroid about 15 km in diameter, leaving a huge scar now called the Chicxulub crater in Yucatan, Mexico. This catastrophe set the stage for the ascendance of our own biological group, the mammals. Although the fact of this impact is now established beyond doubt, the precise means by which an impact could wipe out such a large fraction of the Earth's inhabitants is not fully understood. Recent study of the physical consequences of a large impact on the Earth have revealed a plethora of potentially disastrous effects, ranging from an immediate firestorm that ignited global wildfires to sulfuric acid aerosols, acid rain, and ozone depletion lasting decades. The extinctions caused by these physical traumas changed the way that the Earth's biosphere recycles carbon, leading to climatic changes lasting nearly a million years longer. Although no other major extinction in the past 500 million years can yet be tied unambiguously to an extraterrestrial impact, there is geological evidence of even larger impacts farther back in Earth's history, including the one that created the Sudbury ore body in Ontario more than a billion years ago.

MoreLess

Hide

Share

You can share this video by inserting this link into your emails or posts:

Or you can insert this code into your website, blog, forum, and so on to embed your video.
Pick the colours and the dimensions of the video to customize the embed:

Dimensions



Colours

 

           

           

Preview embed
Hide

Report

If this video has any content that goes against our terms and condition, for example, has explicit adult content, please enter the reason and we will review it shortly.

Please note that if you would like a video removed on copyright grounds, you must provide proof that you are a representative of the copyright holder. In this case, it may be easier to contact us directly.

You have 200 character(s) left.
Hide

Add to Channel

You must be logged in to create or edit a channel. Log in or sign up to take advantage of this feature!
Hide

Add Tags

You must be logged in to add tags. Log in or sign up to take advantage of this feature!

Comments

bill99201 has disabled commenting on pirsa org C04001 126 Death of the Dinos Giant Impacts and Biological Crises wmv.