Mackenzie River Delta (IMAGE) Simon Fraser University Caption These images show before (lower) and after (upper, one day later) onset of dynamic ice breakup in the central Mackenzie delta's middle channel. Credit Simon Fraser University Public Affairs and Media Relations Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.