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The Great Barrier Reef is the world's largest coral reef system, composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres...

The blood–brain barrier (BBB) is a highly selective semipermeable border of endothelial cells that regulates the transfer of solutes and chemicals between...

The Israeli West Bank barrier, comprising the West Bank Wall and the West Bank fence, is a separation barrier built by Israel along the Green Line and...

although the risks are significantly lower than many other sexual activities. Barriers, such as condoms, dental dams, and medical gloves can prevent contact with...

In physics, quantum tunnelling, barrier penetration, or simply tunnelling is a quantum mechanical phenomenon in which an object such as an electron or...

million to 200 million years ago. The protein syncytin, found in the outer barrier of the placenta (the syncytiotrophoblast) between mother and fetus, has...

landform, such as reefs, barrier islands, barrier peninsulas, or isthmuses. Lagoons are commonly divided into coastal lagoons (or barrier lagoons) and atoll...

A mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground. A mountain system or mountain belt is...

larger barrier reef further from the shore with a bigger and deeper lagoon inside. Ultimately, the island sinks below the sea, and the barrier reef becomes...

Barrier islands are a coastal landform, a type of dune system and sand island, where an area of sand has been formed by wave and tidal action parallel...

minor adjustments made in 1972. India constructed a 550-kilometre (340 mi) barrier along the 740 kilometres (460 mi)–776 kilometres (482 mi) LoC by 2004....

the water. Marine shoals also develop either by the in-place drowning of barrier islands as the result of episodic sea level rise or by the erosion and...

vertical barriers along the Mexico–United States border intended to reduce illegal immigration to the United States from Mexico. The barrier is not a...

Expedition to the Barrier Peaks is a 1980 adventure module for the Advanced Dungeons & Dragons role-playing game written by Gary Gygax. While Dungeons...

The Northwest Sumatra–Barrier Islands languages (also Barrier Islands–Batak languages or Sumatran languages) are a group of Malayo-Polynesian languages...

The Thames Barrier is a retractable barrier system built to protect the floodplain of most of Greater London from exceptionally high tides and storm surges...

Spheres. In the Star Trek universe, the Galactic Barrier (also referred to as the Great Barrier or Energy Barrier) is an energy field that surrounds the Milky...

January 1841. It was originally called "The Barrier", with various adjectives including "Great Ice Barrier", as it prevented sailing further south. Ross...

can be thought of as the magnitude of the potential barrier (sometimes called the energy barrier) separating minima of the potential energy surface pertaining...

A Jersey barrier, Jersey wall, or Jersey bump is a modular concrete or plastic barrier employed to separate lanes of traffic. It is designed to minimize...