Today, I went to the natural history museum and saw many things there . I would like to share some of my knowledge with you. Among the 8 planets, it is easy to notice an immense change in size from Mars to Jupiter. This is due to Jupiter, Saturn, Uranus and Neptune being made of gas not rock like the first four planets. If you compare the same mass of gas and rock, gas have far superior volume then rock which results in such differences in size from Mars to Jupiter.

           15 billion years ago, the universe was created via the Big Bang and 4.6 billion years ago the Earth was formed. The Earth is made up of four parts, the crust, the mantle, the outer core and the inner core. The mantle and the core take up most of the Earth¡¯s volume, but the crust is something we humans can¡¯t live without . The crust is made up of solid rock as opposed to the mantle. We can only walk in solid ground not liquidized metal. I hope this simple fact can teach us to not ignore small beings and favor the biggest.