12) The oceans are the largest water reservoir on the planet.

True. cover 71% of the entire earth.

Explanation:

The oceanic mass found ver the earth is well-known mass reserves of 97.3% of all waters in the world. Most Of it exists in salty forms and rest 3% is in the form of lakes and glaciated bodies as the next big reservoirs. They are also considered as the carbon sinks, constantly absorbing the carbon dioxide gas, the Atlantic Ocean covers an area of 82.4 km square with a volume of 323.6, followed by the Pacific Ocean, with 165.2 km area and a volume of 707.6, and the Indian Ocean has an area of 73.4 km and volume of 291.0 km cube. Variability is an important component of the oceanic water there is also water in the earth's mantle and is available at a temperature of 1,100 degrees celsius.