15 Questions Earth Science: All About Water This kahoot explores the structure of water molecules and how water is used on Earth. About how much of the Earth's surface is made up of water? 65% 68% 71% 77% Approximately how much of Earth's water is fresh, drinkable water? 3% 15% 20% 28% How much of the Earth's 3% of fresh water is frozen and unavailable for drinking or crops? 33% 49% 57% 75% … and 12 more awesome questions! Check them out by clicking “Play”.