<The Museum of Natural History>

 Today, I went to the Museum of natural history. In there, I learned about the universe and the earth. The universe was borned 15 billion years ago by the Big Bang. About 4.6 billions years ago, the sun and the planets appeared. They are part of the solar system. There are 8 planets in the solar system.They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. The third planet, Earth, has Cyanobacteria that produce oxygen.This process is called Photosynthesis.

 The earth has four eras. They are Precambrain, Paleozoic, Mesozoic, and Cenozoic. In the Precambrian era, Cyanobacteria produce oxygen and in the Paleozoic era, the creatures began to live on the ground. In Mesozoic, the dinosaurs appeared. The dinosaurs are separated by carnivorous dinosaurs and herbivorous dinosaurs. Carnivorous dinosaurs ate meat, so they have strong teeth and claws. Herbivorous dinosaurs ate plants and they should protect themselves, so they had small teeth and hard horns. They were became extinct after earth was hit by a meteorite. In the Cenozoic era, there were mammoths and humans. Mammoths are similar to elephants, but they are more stronger. They are now extinct, too. Originally humans looked like monkeys, but today, humans are different from monkeys.

 I learned about the universe and the earth so much. I hoped to go there again. It was very interesting.

Good work :)