2. The World’s Oceans

Oceans cover nearly 71 percent of Earth’s surface.   1. Oceans as sources of oxygen, food and energy. Oxygen:  In the process of photosynthesis, phytoplankton release oxygen into the water. Half of the world’s oxygen is produced via phytoplankton photosynthesis. The other half is produced via photosynthesis on land by trees, shrubs, grasses, and other… Read More »