Which phrase best describes the word common, as used in the phrase "the
tragedy of the commons"?

A. A typical result
B. An unwanted effect
c. An unusual object
D. A shared resource

places of higher salinity. there are parts of the ocean where hardly any rain falls but warm dry winds cause lots of evaporation. this evaporation removes water – when water vapour rises into the atmosphere, it leaves the salt behind, so the salinity of the seawater increases. this causes the seawater to become denser.