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Thunderstorm
A thunderstorm, or an electrical storm, is a form of weather characterized by the presence of lightning and its attendant thunder. It is usually accompanied by copious rainfall, hail, or rarely, ... > more -
Dead zone (ecology)
Dead zones are hypoxic (low-oxygen) areas in the world's oceans, the observed incidences of which have been increasing since oceanographers began noting them in the 1970s. The term could as well ... > more -
Underwater explosion
An underwater explosion, also known as an UNDEX, is an explosion beneath the surface of water. The type of explosion may be chemical or nuclear. They are categorised in accordance with their depth ... > more -
Great Lakes
The Great Lakes are a group of five large lakes on or near the United States-Canadian border. They are the largest group of fresh water lakes on the earth and the Great Lakes-St. Lawrence system is ... > more -
Sedimentary rock
Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition of the weathered remains of other rocks (known as ... > more -
Deforestation
Deforestation is the conversion of forested areas to non-forest land use such as arable land, urban use, logged area or wasteland. Historically, this meant conversion to grassland or to its ... > more
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