Document ETH-325: Water Cycle

While it seems that water is a very rare substance upon one’s first look on Eth, with less than 10% covered at any one time, the role of the substance is tied strongly with the organisms. Since the biology of Ethian life is very similar to that of Old Earth, most of the organisms require it in some form. Heterotrophs have specifically evolved to be able to get all their water from respiration, while autotrophs have special organelles that condense it from the atmosphere, which has a high water content. The one exception to this is the species generally called “Laths ”.

Role of Laths
Laths extract their water from the porous rock. Initial investigation suggest that their collective “root” systems span miles, frequently to the lowlands where most water collects. The water is brought to their geothermal sites, where the internal structures of Laths transfer heat energy to the water. This turns the Laths’ microscopic turbines, providing energy to perform metabolism. The water vapour is released into the atmosphere. Collective analysis predicts that laths are the primary reason the atmosphere is so saturated with water.

Role of Rain
Often the water collesques into clouds, covering a significant percentage of the planet. So far, one cloud was observed to cover over 60%. Most of this rain falls quickly and entirely, leaving the the air dry. This often results in a flash flood, clearing the landscape. This is a vital component of the ecosystem, described in further detail in Document ETH-238. The runoff collects in temporary seas, slowly absorbed by the ground. Frequently these seas disappear entirely before the next flood comes around, making any sea life on Eth comprised of only pioneer microorganisms. 