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  2. Body of water - Wikipedia

    en.wikipedia.org/wiki/Body_of_water

    A body of water does not have to be still or contained; rivers, streams, canals, and other geographical features where water moves from one place to another are also considered bodies of water. [2] Most are naturally occurring geographical features, but some are artificial. There are types that can be either.

  3. River - Wikipedia

    en.wikipedia.org/wiki/River

    A stream refers to water that flows in a natural channel, a geographic feature that can contain flowing water. [2] A stream may also be referred to as a watercourse. [2] The study of the movement of water as it occurs on Earth is called hydrology, and their effect on the landscape is covered by geomorphology. [2]

  4. Isthmus - Wikipedia

    en.wikipedia.org/wiki/Isthmus

    Isthmus and land bridge are related terms, with isthmus having a broader meaning. A land bridge is an isthmus connecting Earth's major land masses. The term land bridge is usually used in biogeology to describe land connections that used to exist between continents at various times and were important for the migration of people and various ...

  5. Ocean - Wikipedia

    en.wikipedia.org/wiki/Ocean

    Water volume: 1,370,000,000 km 3 ... The ocean's surface is an important reference point for oceanography and geography, particularly as mean sea level.

  6. Bay - Wikipedia

    en.wikipedia.org/wiki/Bay

    A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, a lake, or another bay. [1] [2] [3] A large bay is usually called a gulf, sea, sound, or bight. A cove is a small, circular bay with a narrow entrance. A fjord is an elongated bay formed by glacial action. [4]

  7. Lake - Wikipedia

    en.wikipedia.org/wiki/Lake

    The area measured at the mean water level exceeds an arbitrarily chosen ... which is despite its name considered as a lake from the point of view of geography. ...

  8. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    Water is also central to acid-base neutrality and enzyme function. An acid, a hydrogen ion (H +, that is, a proton) donor, can be neutralized by a base, a proton acceptor such as a hydroxide ion (OH −) to form water. Water is considered to be neutral, with a pH (the negative log of the hydrogen ion concentration) of 7 in an ideal state.

  9. Origin of water on Earth - Wikipedia

    en.wikipedia.org/wiki/Origin_of_water_on_Earth

    Hydrated silicates on the surface transport water into the mantle at convergent plate boundaries, where oceanic crust is subducted underneath continental crust. While it is difficult to estimate the total water content of the mantle due to limited samples, approximately three times the mass of the Earth's oceans could be stored there. [21]