Earthquakes cause rapid changes on earth. An earthquake is a vibration or shaking of Earth’s crust. Most earthquakes occur along faults. A fault is a break in the crust along which rock moves. Rock on either side of a fault can move up and down, side to side, or both. Earthquakes are measured on a Richter Scale which uses numbers from 1-9.
A volcano is a mountain that forms when red hot melted rock flows through a crack onto the earth’s surface.
Melted rock inside Earth is called magma.
Melted rock that reaches Earth’s surface is called lava.
The lava and gases that erupt from volcanoes are very hot and often destroy everything in their path. Volcanic eruptions also form new crust on continents.
A volcano is a mountain that forms when red hot melted rock flows through a crack onto the earth’s surface.
Melted rock inside Earth is called magma.
Melted rock that reaches Earth’s surface is called lava.
The lava and gases that erupt from volcanoes are very hot and often destroy everything in their path. Volcanic eruptions also form new crust on continents.