Cardiopulmonary Resuscitation (CPR) is an emergency medical procedure consisting of a combination of rescue breathing and chest compressions delivered to victims thought to be in cardiac arrest. It can be ...

A blue hole is a submarine cave or sinkhole. They are also called vertical caves. There are many different Blue Holes located around the world, such as in the Bahamas ...

A eutrophic body of water, commonly a lake or pond has high primary productivity due to excessive nutrients and is subject to algal blooms resulting in poor water quality ...

A meromictic lake has layers of water that do not intermix. Wetzel, Robert G. (2001). Limnology: Lake and River Ecosystems (Third Edition) (Academic Press, New York). ISBN 978-0127447605. In ordinary ...

The environmental impacts of dams have come under renewed examination in recent years.

The continental shelf is the extended perimeter of each continent and associated coastal plain, and was part of the continent during the glacial periods, but is undersea during interglacial periods ...

Blue Hole is a diving location on east Sinai, a few kilometres north of Dahab, Egypt on the coast of the Red Sea.

An estuary is a partly enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open ...