My Timeline

1. My Timeline By Kip Cederstrom

2. I chose this because Alfred Wegener was the main person who knew about all this. He was also the only one that actually had the guts to go up in front of everyone and tell them. If it weren’t for Alfred Wegener, we might still be wondering about how the world works, or maybe not even know about plate tectonics. Also, it’s pretty amazing that even so many years ago, they still were able to notice things like that and test them. Today, we could almost take a picture of the plates, but without Alfred Wegener, we might not even think to look at them. I chose this because I thought that this was important. The Navy would have the tools and money back then, more so than some scientists. This is after Alfred’s theory, and technology has advanced, so that’s where sonar comes in. Sonar is very cool. Today, we have sonar that can see hundreds of miles, and see way deeper into the ocean, but in 1950, this is big. The Navy made a huge discovery. Harry Hess proposed the theory of sea-floor spreading. Harry Hess’s theory that the mantle goes under thermal convection. I chose this because Harry Hess had very little technology back then. This was a huge breakthrough. With the technology we have today, we could figure that out but he figures this out with none of what we have today. Also, thermal convection is important. Without Harry discovering this, we might still be wondering why heat rises. Harry Hess was an important character in the 1900’s. This was his second breakthrough. I don’t know exactly where he got his ideas, but they are true, and they seem impossible to figure out. Sea-floor spreading is important because this could be partly why the continents move. The magma pushes up and out, whilst moving the continents. Alfred Wegener proposed a theory of Continental Drift. The nave used sonar to map the ocean floor. Discovery of mid-ocean ridges.