Earth is a special place

Earth is a special place. The Earth turns imperceptibly. It turns very fast, because of the gravity we can't feel it. The Earth has three parts. It is the crust, mantle and the core. The crust is the outside part of the Earth. The core is all lava. It is very hot in there. The middle of the Earth is very mysterious. No one will know what is going to happen next.

http://www.sfscience.com/english/grade_5/unit_C/chap