'Calving' glacier:

A spectacular sight to behold.

'On May 28, 2008, Adam LeWinter and Director Jeff Orlowski filmed a historic breakup at the Ilulissat Glacier in Western Greenland. The calving event lasted for 75 minutes and the glacier retreated a full mile across a calving face three miles wide. The height of the ice is about 3,000 feet [900m], 300-400 feet [100m] above water and the rest below water.'

Clash: chain of events

Propulsion; momentum; clash; sinew; sock; speed; clash and bounce.
A collision between a member of the South African Junior Rugby World Cup team, a member of the English team and a panel of the LED advertising board on the field. 2012. (Youtube)

Amazing documentation of American Football

Click thru to flickr links for more information,
All from my favourite news image site, CLIK/HEAR: The Palm Beach Post