Hydrosphere. Only planet with correct atmospheric pressure and temperature to allow water to exist in all its phases 97% water held in ocean basins 2% water frozen Only 1 % water fresh *. Figure 2-11 (Merritts et al., 1998). Image ID: corp1893, NOAA Corps Collection
to allow water to
exist in all its phases
Figure 2-11 (Merritts et al., 1998)
Location: Alaska Southeast
Photo Date: August 1991
Photographer: Commander John Bortniak, NOAA Corps
Water sources for Earth included
1) water from icy comets,
2) volcanoes, and 3) minerals.
transpirate (to atmosphere).
Wetland losses in the U.S.In the 1660’s, 220 million acres of wetlands were thought to exist in the U.S. By 1980, only 103 million acres remained.