1. Markowa Nadejda 10 B

2. The word "volcano" originates from the name of the roman god of fire Volcano. In ancient time, volcanoes called the great forge of this god. The eruption of the volcano were a sign that god Volcano forges a new weapon.

7. Lava - the magma that flows on the surface of the earth during eruptions, and then solidify. The outpouring of lava can occur from the main summit of the crater, the side of the crater on the slope of a volcano or from cracks, connected with the volcanic fire. It flows down the slope in the form of a lava flow. In some cases there is an outpouring of lava in the rift zones of great length. For example, in Iceland in 1783 within a chain of craters Lucky, stretched out along a tectonic fracture at a distance of approx. 20 km, there was an outpouring of vac 12, 5 km3 of lava, covering the square vac 570 km2.

8. Hard rock, formed during the cooling of the lava, contain mostly silicon dioxide, oxides of aluminum, iron, magnesium, calcium, sodium, potassium, titanium and water. Usually in lavas of the content of each of these components is greater than one percent, and many other elements are present in smaller quantities.

11. Earth's plates