Lava tubes are natural conduits through which lava travels beneath the surface of a lava flow. Typically they are expelled by a volcano during an eruption and can be actively draining lava from a source; or they can be extinct, meaning the lava flow has ceased and the rock has cooled and left a…
Animals bridges, which may also be known as ecoducts or wildlife crossings, are structures that allow animals to safely cross human-made barriers like highways. A wildlife crossing is the broadest term and can include: underpass tunnels, viaducts, overpasses and bridges, amphibian tunnels, fish ladders, culvets and green roofs. [Source] Wildlife crossings are a practice…
As you would imagine, the highest point is found at the peak of the continent’s highest mountain. In mountaineering this is known as the Seven Summits, which was first postulated and achieved on April 30, 1985 by Richard Bass. Below you can see the highest points on every continent compared to the “Eight-Thousanders“,…
A tripoint, trijunction, or triple point (also, if inexactly, known as a tri-border area), is a geographical point at which the borders of three countries or subnational entities meet. There are currently 157 international tripoints (i.e., tricountry points) by some accounts, and as many as 176 (or even 207) by others. Nearly half of…
In geography, a confluence is the meeting of two or more bodies of water. Known also as a conflux, it refers either to the point where a tributary joins a larger river, called the main stem, or where two streams meet to become the source of a river of a new name, such as…
Hong Kong – Photograph by CHENSIYUAN A high-rise is defined as a structure at least 35 meters (115 feet) or 12 stories tall. Below is a list of the 25 cities with the most high-rise buildings in the world. The complete list of cities around the world with at least one hundred high-rise…
