Energy Diagram (IMAGE) University of Utah Caption A diagram of the free energy barrier depicts the energy required to sustain ice nucleation, with a small diagram of a sufficiently-sized crystallite at the peak of the barrier. A larger-scale model (right) shows a cubic segment of a larger crystallite, with cubically-stacked molecules in red and hexagonally-stacked molecules in blue. Credit University of Utah Usage Restrictions Credit University of Utah 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.