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A bridge is a structure built to span physical obstacles without closing the way underneath such as a body of water, valley, or road, for the purpose of providing passage over the obstacle.   Until the end of the 18th Century, bridges were made out of timber, stone and masonry. Modern bridges are currently built in concrete, steel, fiber reinforced polymers (FRP), stainless steel or combinations of those materials.   Iron and Steel bridges are used today and most of the worlds major rivers are crossed by this type. The picture shows the first iron bridge in the world. It was built in Telford in 1779 by Abraham Darby (the third) and was the first large structure in history to be constructed from iron.   In a common variant, the suspended span, the cantilever arms do not meet in the center; instead, they support a central truss bridge which rests on the ends of the cantilever arms. The suspended span may be built off-site and lifted into place, or const...

A waterfall is a place where water flows over a vertical drop or a series of drops in the course of a stream or river. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf   A cascade of water falling from a height, formed when a river or stream flows over a precipice or steep incline.   Waterfalls often form in the upper stages of a river where it flows over different bands of rock. It erodes soft rock more quickly than hard rock and this may lead to the creation of a waterfall . Formation of a waterfall : The soft rock erodes more quickly, undercutting the hard rock.   Waterfalls keep falling because rivers and streams keep flowing. Rivers and streams collect water from a broad watershed. As long as it rains somewhere in that watershed occasionally, the river will keep flowing. If you have a bucket full of water and punch a hole near the bottom, the water will flow fast at first and gradually slow down as the l...

The Northern Golden Orb Weaver or Giant Golden Orb Weaver (Nephila pilipes) is a species of golden orb-web spider . It can be found in Japan, China, Vietnam, Cambodia, Taiwan, Malaysia, Singapore, Myanmar, Indonesia, Thailand, Laos, Philippines, Sri Lanka , ... It is one of the biggest spiders in the world.

A dragonfly is an insect belonging to the order Odonata, suborder Anisoptera. Adult dragonflies are characterized by large multifaceted eyes, two pairs of strong transparent wings, sometimes with coloured patches and an elongated body. Scientific name : Anisoptera Higher classification : Odonate Rank : Suborder

A dragonfly is an insect belonging to the order Odonata, suborder Anisoptera. Adult dragonflies are characterized by large multifaceted eyes, two pairs of strong transparent wings, sometimes with coloured patches and an elongated body. Wikipedia Scientific name : Anisoptera Higher classification : Odonate Rank : Suborder       The dragonfly, owing to its position in the food chain, is not scared…so if you find one flying over to you and sometimes looking you in the eye for a few moments, don’t be surprised or shocked. It’s what it does…look with its 30,000 eyes, to find food and mates. Oh, while 30,000 is an approximate number, it is the number of ommatidia that dragonflies have within their compound eyes. - See more at: http://www.dragonfly-site.com/#sthash.7uTFgS5o.dpuf   The word Dragonfly and the family it belongs to, Odonata, have evolved from the many myths associated with Dragonflies and their taxonomic cousi...