Instructional Video
Khan Academy

Khan Academy: Liquid Water Denser Than Solid Water (Ice)

9th - 10th
Explore the property of water that makes it less dense as ice in this video. Learn why lakes don't freeze solid. [5:42]
Instructional Video
Next Vista for Learning

Next Vista for Learning: Cohesion

9th - 10th
A video investigating how water sticks together to form droplets, lakes, bays, and pool. Understand the property of cohesion which allows water to stick to each other by hydrogen bonds.[1:22]