10 Spectacular Volcanic Plugs & Natural Monoliths

"The Pico Cão Grande (Great Dog Peak) is a landmark needle-shaped volcanic plug peak in São Tomé and Príncipe, located in the south of São Tomé Island in Obo National Park." 

"A volcanic plug, also called a volcanic neck, is a volcanic landform created when magma hardens within a vent on an active volcano. A natural monolith is a mountain or large rock formation consisting of a single massive stone. Both types of these geological structures are similar in that they are often steeply rising above the surrounding terrain. The unusual appearance and the buildings which are often located on these structures, amaze visitors and attract them to come back again."


Length of Countries' Land Borders

This map shows length of land boundaries border countries in each country.

The total length of land boundaries in the world: 251,060 km

This entry contains the total length of all land boundaries and the individual lengths for each of the contiguous border countries. When available, official lengths published by national statistical agencies are used. Because surveying methods may differ, country border lengths reported by contiguous countries may differ.

via chartsbin.com


This is more than challenging - it's humiliating. I hesitate to call it fun, but actually it was. No wonder we don't understand what's going on over there!

Drag the country's name onto the map. There is no score or time limit. This is a learning tool. Don't be afraid to make an error, try again [and again, if need be!] and once you have finished the puzzle you will be far more educated about this very intense part of our world."



Sent by Bob...Thanks !