TECTONIC PLATES

Close examination of a globe often results in the observation that most of the continents seem to fit together like a puzzle: the west African coastline seems to snuggle nicely into the east coast of South America and the Caribbean sea; and a similar fit appears across the Pacific.  The fit is even more striking when the submerged continental shelves are compared rather than the coastlines.  undefinedIn 1912 Alfred Wegener (1880-1930) noticed the same thing and proposed that the continents were once compressed into a single protocontinent which he called Pangaea (meaning "all lands"), and over time they have drifted apart into their current distribution. He believed that Pangaea was intact until the late  Carboniferous period, about 300 million years ago, when it began to break up and drift apart. However, Wegener's hypothesis lacked a geological mechanism to explain how the continents could drift across the earths surface as he proposed.

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10 Things to Know about Pyramids

 1. If you broke the Great pyramid into slabs 30 cm thick you could build up a wall 1 metre high that would stretch all the way around France! If you had a little more time you could cut it into rods about 6cm 2 - join them together and it would be enough to reach a quarter of the way to the moon!

2. Some people have said that the pyramids are more than simply large graves; they were granaries or treasure houses.

3. All of the pyramids were probably robbed of their treasures within a couple of hundred years of the burials. The only tombs to escape until modern times were those dug into rock, not placed in pyramids. They belonged to Tutankhamun and Queen Heterpheres.