Today, I go to the Seodaemun museum of natural history. When I was young, I went many time to this museum. So I knew well about Seodaemun museum of natural history.

The universe was born about 15 billion years ago during the Big Bang, and 4.6 billion years ago, the Earth was formed/

The solar system, there is one fixed star and 8planet. The order of 8planet is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.

The progress of Earth is simple. First, crushet to the Earth and the volcano was eruption, and the many gas and magma is come out, and Earth covered to magma. Next, is too rainy in the Earth and the sea is made at that time. So we can live in the Earth.

Next, is the cyanobacteria is do photosynthesis and they are made an oxygen. It is important thing people live in the Earth.

The four Eras are in the world. One is Precambrian Era, and Paleozoic Era, Mesozoic Era, and Cenozoic Era. The bacteria live in Precambrian Era, and the reptile is in Paleozoic Era, and dinosaur is in the Mesozoic Era, and human is in the Mesozoic Era.

Today is very important day in the month. Because I learned today the 4 Era, it¡¯s very important thing. Because I don¡¯t know that. So, I like today¡¯s class and I want go again this place.