Hydrosphere

For normal worlds, the hydrosphere will be water; on other worlds (with exotic, corrosive, or insidious Atmospheres), it may be other liquids or fluids such as ammonia.

Some worlds with vacuum atmospheres may have hydrographic percentages greater than 0 indicating that the world has ice caps present; the water will not be freestanding liquid. A Desert World may have up to 4% free-standing water and still be considered a Desert World. Conversely, a Water World may have a 95% hydrosphere and still be considered a Water World.

Hydrographic Codes

Code	Description	% Surface Water
0	Desert World	0 - 4
1	Dry World	5 - 14
2	Dry World	15 - 24
3	Wet World	25 - 34
4	Wet World	35 - 44
5	Wet World	45 - 54
6	Wet World	55 - 64
7	Wet World	65 - 74
8	Wet World	75 - 84
9	Wet World	85 - 94
A	Water World	95 - 100

- Source: MT Referee's Manual