Why do the continents look like a puzzle?
My Grandfather had noticed and pointed an odd occurrence on my map when I was younger. He noticed that all the continents could fit together like puzzle pieces. I hadn't noticed it until he pointed it out to me. For a very long time I thought this was simply a coincidence, but in Science I learned I was wrong. Alfred Wegener was one of the first to identify and support this theory. The only problem was that he couldn't explain what force could push these large masses of land apart from each other. A few years later, scientists discovered the force was plate tectonics. Basically, the earth's outside or crust, is like a big cracked egg. The big hot magma in the inside of the earth has a big current because of the changing heat, also known as a convection current. The hot things rise, and the cold things fall. When things change height, the heat changes and they go in an infinite cycle of of heat. This current pushes hot lava out some places, eats land up other times, or just rubs the plates against each other. Alfred Wegener was in fact, correct. The Earth millions of years ago had one large continent called Pangaea. Over time the plates shifted and broke apart Pangaea. In the far future, Pangaea will reform.