Oceanography The study of the earth's oceans and their interlinked ecosystems , geological, chemical and physical processes. http://video.nationalgeographic.com/video/oceans-narrated-by-sylvia-earle/oceans-overview

Origin of Oceans As volcanoes erupted, they spewed lava, ash, water vapor, carbon dioxide, and other gases. Scientists hypothesize that about 4 billion years ago, water vapor accumulated in Earth’s atmosphere. After millions of years, it cooled enough to condense into storm clouds Torrential rains began to fall and fill basins, which eventually joined to form oceans.

Origin of Oceans About 71% of the Earth’s surface is covered with water. The oceans hold 97% of Earth’s water. About 3% of Earth’s water is fresh water.

Less than 1% of ALL water on Earth is usable to humans! Origin of Oceans Less than 1% of ALL water on Earth is usable to humans! http://video.nationalgeographic.com/video/env-freshwater-whycare

Water on Earth

Origin of Oceans Groundwater is stored in aquifers Icecaps & Glaciers are found at the poles and in Greenland