In class we watched a video about earthquakes. It explained how earthquakes occur, why do they occur. It talked about seismographs, machines that calculate the earth's movement. The Earth is really flexible. It is made of plates called tectonic plates. As the plates move, they crack and the cracks are called faults. The epicenter is the center of the earthquake. One of the things I liked was the explanation when Bill Nye was in the pool. The water in the pool represented the Earth's interior. It explains why in a volcano eruption we can see the lava coming out from the Earth's crust. On the top of the water he put the map of the world made of board. Every board was one tectonic plate. When the water was moving, the plates moved also.
The video in some parts gave recommendations on how to build your own seismograph.
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