Today we went to the museum of natural history. We learned about animals, the universe and the earth's history. I was interested in the universe and the earth's history.

First, the universe was created about 15 billion years ago, because of big bang. Big bang was great eruption which made stars, planets, and meteors.

Next, the earth was formed about 4.6 billion years ago. At the beginning, the earth was covered with magma but later the earth became cooler so magma was cool down. Next, there were much water. In water there were many small animals. And then Cyanobacteria was appeared which produce oxygen so various living things can live on ground such as dinosaurs. Finally there came ice age, so most of living things were dead. However humans survived. That humans have evolved, so we are here.