What makes a waterfall?

On its way to the sea, a river or stream may plunge over a steep cliff.  If it does, there is a waterfalls in mountains than anywhere else.  Many waterfalls were caused when ancient glaciers of earthquakes created a sharp-edged cliff in the path of a stream or river.  

Often, waterfalls are caused as the river carves away at the riverbed as it flows downstream.  Over the years, a softer place in the riverbed wears down and becomes a steep cliff.

Giant waterfalls are called cater acts.  Where the water does not drop straight down, but rushes down steep slopes instead, it is called a cascades.  If a riverbed slopes even less steeply, it is often called a rapids.  

As far as anyone knows, the highest waterfalls in the world is Angel Falls in Venezuela.  It is a silvery ribbon of falling water that plunges over 3,000 feet down the face of a cliff. – Dick Rogers

History's smallest whale shark rescued in Sorsogon (2)

The team freed the shark from the rope that was tied around its tail. After checking to see that the animal was unhurt, documenting the discovery, and measuring the shark, they transferred it into a large, water-filled plastic bag to allow it to swim freely while preparing for its release. Less than three hours after the report first reached Donsol, the response team was back on their banca, shark safely in hand. They took the shark out to deeper water, where it was less likely to get entangled in a fish net, and there, they set it free.

In spite of all the research that is being done worldwide on whale sharks, to this date no one knows where they breed or give birth. The Pilar 'pup' was so small, it was probably born here and could have been what biologists call a neo-nate. Not only is this animal the smallest live whale shark on record ever to be captured and released here in the Philippines (and arguably, anywhere in the world), it is also the first indication that the Philippines, at the apex of the Coral Triangle, is probably one of the places on the planet where these giants of the sea are born.

For many years, scientists thought that Donsol was merely one of many 'gas stations' along the global network of marine highways where whale sharks cruised. This new discovery is the first ever indication that this coastline may actually be a 'birthing site'. - Jose Ma. Lorenzo Tan, WWF-Philippines vice-chairman and CEO