Today, I went to Museum of Natural History. 4.6 billion years ago during Bigbang Earth was form. Also, in outer space there is Solar system include earth which are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. They rotate themselves and earth revolves around the sun.

      From now on I'm gonna tell you about Geographic period. And it is devide into four parts which are Precanbrian era, Paleozoic era, Mesozoic Era and Cenozoic era.

     First is Precambrian era. In this era single cells and bacterias were lived here. Bacterias are living cells that produce oxygen and breath in carbon dioxide with photosynthesis. Since these little cells fixed the Earth with oxygen, there were various living things.

    Second is Paleozic era. In this era fish and reptile and more develop creature live here. Which mean not single cell anymore.

     Next is Mesozoic era. In this era dinosaurs live here. And we can devide it into two parts which is carnivore and herbivorous.

     Finall period is cenozoic era. In this era human and mammoth were lived here. Human and mammoth are mammal and they born babies and also they don't have cold boold. Thus, their temperature does not change from environment.

       I think this museum was helpful to know more about our earth.