We all (I assume) live on this lump that we call earth. It is very old. We use it every day. We usually don’t pay much attention to it, although it is becoming increasingly and scarily apparent that we should.
Earth is mostly made of rock. But what exactly is rock and what can we learn from it?
The Open University has kindly created a primer for all of us primates on exactly that topic. See the video, below.
Read more here courtesy of TheOpenUniversity.org
