The high pressures within the interiors of Uranus and Neptune cause both water and rock to be more dense than in their uncompressed states. So water and other low-density ices, such as ammonia and methane, must be the major compositional components of Uranus and Neptune, with lesser amounts of silicates and metals. The total amount of hydrogen and helium in these planets is probably limited to no more than 1 or 2 M¢, with most of these gases residing in their relatively shallow atmospheres. On the basis of density alone, as we pointed out at the beginning of this chapter, neither Uranus nor Neptune very well fits the description of a gas giant. It is more appropriate to call them ice giants. The water that makes up so much of Uranus and Neptune is probably in the form of deep oceans. Dissolved gases and salts would make these oceans electrically conducting.