Earth has been restless ever since it solidified from a giant ball of gas more than 4.6 billion years ago. Since then earthquakes have shaken the continents and oceans and volcanoes have spewed out the molten insides of our planet. But what exactly are these aweinspiring and devastating natural phenomena? Why do they occur and why are they often in the same regions? How have they affected human civilization? By studying earthquakes and volcanoes you can begin to understand the inner workings and layered composition of Earth. Discover plate tectonics and see how volcanoes and earthquakes are just the consequences of the constant movement of the planet?s parts. Erupt two types of volcanoes to imitate how lava hardens into rock and volcanic mountains grow. Build a working seismograph to see for yourself how scientists measure earthquake forces. Learn about the most famous volcanoes earthquakes and tsunamis in history.
