Question

The salinity of freshwater is less than _______ g/kg.
A. 2
B. 1.5
C. 1
D. 0.5

Answer 1

The salinity of freshwater is less than 0.5 g/kg. Freshwater has low salinity due to the evaporation and precipitation cycle, differentiating it from oceans that have a constant high salt content.

Step-by-step explanation:

The salinity of freshwater is less than 0.5 g/kg. Fresh water contains low levels of dissolved substances such as salts due to the rapid cycle of evaporation and precipitation. In contrast, oceans maintain a high salt content. Freshwater ecosystems and marine ecosystems interface in brackish water environments, where the salinity ranges between freshwater and marine levels. Lakes in closed basins can also concentrate salts.

Only about 2.5 percent of Earth's water is freshwater, and even less is readily accessible to living organisms.