Archive for the ‘geology’ Category

The book I read to research this post was Voyage Of The Beagle by Charles Darwin which is an excellent book which I got from the library.

Charles Darwin was born in shrewsbury and attended Edinburgh University & Christs College in Cambridge. He completed his degree in 1831 and soon aterwards made a 5 year voyage on HMS Beagle which travelled around the world but in particular studied the coastline of Patagonia and Tierra del Fuego in South America. He had some of his letters published in scientific journals and became a bit of a celebrity. He became a fellow of the Royal Society in 1839. For most of the rest of his life he was developing and writing about his theory of natural selection. It is basically survival of the fittest whereby if a genetic feature is useful it is kept but if it is useless it dies out. He married his wife Emma Wedgwood in 1839 and spent many years at Down House in Kent. He died in 1882 and is buried in Westminster Abbey.

 

Geology

Posted: October 1, 2011 in geology, plate tectonics

The surface of the earth consists of huge plates or huge slabs where the surface has cooled. It floats on the magma which is called plate tectonics.  When these plates collide mountain ranges are formed and when they separate trenches are formed. This movement is called continental drift. At one time all the continents were joined and it was called pangaea. This was thought because fossils of the same type were found in continents which are now thousands of miles apart. In the 1950’s it was found that the magnetism which is caused by the magnetic poles of the earth didn’t correspond to the current positions of the continents. Then in the 1960’s in the atlantic it was noticed that there was rows of rock magnetised one way and then the other which was obviously due to it being formed when the poles shifted. This showed the continents were indeed moving apart.