Three quarters of the planet Earth are covered by water. Most of the planet's solid surface is abyssal plain, at depths … See more

Water is a transparent, tasteless, odorless, and nearly colorless chemical substance. Its chemical formula is H2O, meaning that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. … See more

An aquatic ecosystem is an ecosystem in a body of water. Communities of organisms that are dependent on each other and on their environment live in aquatic ecosystems. The two main types of aquatic ecosystems are … See more

Although a number of human activities are conducted underwater—such as research, underwater diving for work or recreation, and underwater warfare with submarines, the underwater environment is hostile to humans in … See more

• Hydrology – Science of the movement, distribution, and quality of water on Earth
• Hydrography – Measurement of bodies of water
• Limnology – Science of inland aquatic ecosystems… See more

• Timeline of diving technology – Chronological list of notable events in the history of underwater diving equipment
• Underwater acoustics – Study of the propagation of sound in water… See more