Get the world into perspective. Trust me, it's a big place.
>> Wednesday, June 29, 2011
Here's something that makes me go all weird for a few minutes if I think about it: the Earth's crust is only 70km thick at it's largest point, and something like 5-10km thick at the lowest points of the ocean bed. below that is 2,200km of mantle. Have you ever seen lava flow from a volcano? That stuff is magma. This swirls round at stupidly hot temperatures at very high pressure, and moves the earths crust around. Want to know what causes things like earthquakes and grounds your flight to Iceland? That'll be the mantle. below that is the core. This is mostly iron and is more dense than your average Big Brother contestant. it's constant moving causes the magnetic field that helps you find your way. It is unimaginably hot, and the whole shebang goes down a total of 6,500km, which is about the distance from England to Uganda. Wowzers!
Now, look at the ground. All that is going on right under your feet, right now!
