Water is a unique compound that is essential to life on Earth. In the pedosphere ... by this property Expansion upon freezing Ordering molecules in crystalline solid results in more void space ...

The little spheres represent water molecules. Molecules are in constant motion. The attractions water molecules have for each other keep them close together. They can move past each other, but their ...

Evidence is mounting about what may be a wealth of organic molecules ... with liquid water on its surface in the distant past. Scientists suspect that microbial life once could have lived ...