Volcanos

__//**Volcanos**//__- A volcano is a mountain or hill formed by the accumulation of magma or molten rock. Magma is typically produced at depths of 50 to 60 miles below the surface; because liquid magma is less dense than solid rock, it is pushed out of cracks in the Earth's surface. Volcanic eruptions can be deadly, damaging property and infrastructure. Click Here

Volcanos are one of the most powerful forces in nature. A volcano is a hole in the earth’s crust. The hollow holes that are in volcanoes are called craters. There are different types of volcanoes; shield-volcanoes, cinder cone volcanoes, lava domes and the most common - composite volcanoes. Volcanoes are basically hollowed-out mountains with connections to the Earth’s magma core. There are over 500 volcanoes in the world. The volcanoes are contained in a circle called the Ring of Fire.


 * Volcanic eruptions start in a magma chamber. The high pressure of the steams and gasses make the magma fill the magma chamber.
 * When the chamber is full, the type of eruption depends on the amount of gases and silica in the magma.
 * The amount of silica determines how sticky the magma is and the amount of water determines the explosive potential of the steam.

Click here to watch the Volcano Study Jam. Take the test and tell me your grade.