The document provides basic facts about water, including that 71% of the Earth's surface is covered by water, World Water Day is celebrated on March 22nd, fresh water makes up 2.5% of the Earth's total water, Martin Strel is known as the "Big River Man", hydrography is the study of water distribution, the human body contains 60% water, hydrogeology is the study of groundwater distribution and movement, water reaches its maximum density at 4 degrees Celsius, and pure water has a pH of 7.