Frae Wikipedia Lowp tae: navigation, rake Watter covers 70% o
the Yird's surface.  Hydrology is the study o the movement,
distribution, an quality o watter on Yird an ither planets,
includin the hydrologic cycle, watter resoorces an environmental
wattershed sustainability. A practitioner o hydrology is a
hydrologist, wirkin within the fields o yird or environmental
science, pheesical geografie, geology or ceevil an environmental
ingineerin.  Hydrology is subdividit intae surface hydrology an
marine hydrology. Domains o hydrology include hydrometeorology,
surface hydrology, hydrogeology, drainage basin management an
watter quality, whaur watter plays the central role.
Oceanografie an meteorology are nae includit acause watter is
anly ane o mony important aspects within those fields.
Hydrological research can inform environmental ingineerin,
policy an plannin.  The term hydrology is frae Greek: ὕδωρ,
hydōr, "watter"; an λόγος, logos, "study".