About 70% of earth's freshwater is
underground
found in rivers and lakes
frozen in glaciers and ice caps
is oceans and seas

About 70% of the Earth's water is currently frozen. As the threat of global warming increases, this number is steadily decreasing, which creates a rise in the average seawater. Previously frozen water is now melting. Of all the currently available non frozen water, the majority of is found the oceans and seas.

The answer is b im not sure 

Answer light in color; silica-rich;