An earth house is like a special type of house that is built to be mostly underground, kind of like a cozy hobbit hole! People build them by digging a big hole in the ground, and then using the dirt and other materials they find to make the walls and roof of the house. This helps to keep the inside of the house very warm in the winter and cool in the summer, because the ground acts like a natural insulated layer.
Earth houses are also good for the environment because they use natural materials, like clay and straw, and they don't require as much power to heat and cool them. Plus, they look really cool and unique, just like a little fairy tale hideout!