I learned two important things.  The first is about the solar system, and the next is about the history of living things. The Universe was formed about fifteen billlion years ago, and the Earth was formed about 4.6 billion years ago. A long time ago, the Earth's continents were connected as one piece of land. This is called Pangaea. There are 8 planets. The planet closest to the Sun is Mercury, and the other planets are Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Actually, there was one other planet named Pluto, but people don't consider it a planet in the solar system anymore. Astronomical charts were already drawn in the Goguryo and the Joseon Dynasties. An opening in the earth's crust through which magma is ejected is called a volcano. Baekdu mountain and Hanra mountain, which are on the Han Peninsula, were made by volcanic eruptions. Now let's talk about the history of living things. Cyanobacteria are living cells, which formed during the Precambrian Era, and they produce oxygen through photosyntheis. Dinosaurs appeared in the Mesozoic Era. The most important carnivorous dinosaur is the Tyrannosaurus. They eat meat. The most important herbivorous dinosaur is the Stegosaurus.  It protects itself with its horn. There are many other dinosaurs, but I don't know all of them.  My favorite part of the Museum of Natural History was about Pangaea, and I want to know more about it when I travel.

* Hi,

Great job! You have a lot of good information here, and it seems like you learned a lot! Try not to start your sentences with 'and,' and don't forget to put periods and commas in the right places.