Today, we went to Museum of Natural History. In there, there were lots of interesting grahpes, pictures, and things. The Universe was born about 15 billion years ago in Big Bang. The planet that we live on, Earth was formed. Before Big Bang, there were nothing but darkness. But after Big Bang, magma came out,then it began to rain. The magma hardened, and became a rock. Then, because of water, there was huge  puddle. This is nowdays, ocean. A long time ago,the continents were connected as one piece of  land  called Pangea. If you look at the continents carefully, you can see that they used to be connected. Of course, besides Earth, there are lots of planets in our solar system. They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. There was Pluto too, but it was so small to be a planet, and it was revolving in oval shape, not in circle. When a planet turns on its axis, it's called a rotation. This takes one day. When it revolves around the Sun, this is called a revolution. This takes one year. If you want to know something interesting, Did you know that each planet(not including Earth) represent each Greece God? Mercury to Hermes, Venus to Aprodite, Mars to Ares, Jupiter to Zeus, Saturn to Kronos, Uranus to Uranus, Neptune to Poseidon. An opening in the Earth's crust through which magma is ejected is called a volcano. Baekdu Mountain and Halla Mountain on the Han Penisula were made by volcano eruption. Now days, Baekdu and Halla Mountain is in active volcanoes. Inactive volcanoes are volcanoes that stopped working.Cyano bacteria are living cells that produce oxygen through photo synthesis. Since this little cells filled Earth with oxygen, there were various living things. About 6,500 millon years ago, dinosours disappeared.There were two types of dinosours, Herbivorous and carnivorous. Herbivorous ate grass. Carnivorous atemeat. Acrocanthosaurus is a good example of carnivorous. They were frightening and ate meat. Their main feature was the long saw-like protusion that developed from their neck to their tailbone.I was amazed how Universe was formed, and how interesting that Earth looked

4.6 billion years ago.