وادى الريان2020

The volcano 1 - volcano: A crater in circular shape almost above the ground and be high altitude from the surface of the earth comes out of molten rocks, gases and black ash, which is known as volcanic ash. 2 - Types of volcanoes - Dormant volcanoes / volcanoes are not dangerous because they have lost their properties thousands of years. - Active volcanoes / volcanoes representing the danger of lava uttering molten rocks, toxic gases and volcanic ash One characteristic of the volcano is that it can be found on land or in water What Hua activity corner?  Volcanic eruptions are the result of two main factors: density and pressure. The low density of molten metals relative to the surrounding rock leads to their rise to the surface, and when they rise, bubbles start to form from the gas dissolved in the molten gas. Bubbles are a great pressure to bring molten metals and ash to the surface. The volcano is one of the most violent natural phe...