Which type of magma is light in color, low density, high in Silica and is explosive when erupts?

Awatershed is a piece of land that drains water into a particular stream, lake, or river. which of the following factors often negatively impacts the water quality in a watershed? a.) wetlands b.) pollution c.) irrigation d.)rainfall

Reason i shouldnt turn back if i'm lost in the wilderness need fast

How do oceanographers measure the salinity of ocean water?