Oceanographers are people who study oceans.
The subjects that interest them include physical oceanography - the study of physical changes in ocean waters caused by external forces such as heat, gravity and the rotation of the earth. The physical state of the sea is important to marine life, and so is its chemical state. Chemical oceanographers study the inorganic and organic substances found in seawater and the chemical changes that they undergo. Waves, produced by physical forces, affect the accessibility of Gray's Reef by boat. Animals and plants living on the Reef are sometimes damaged by these waves.