Where does the lava of volcanoes come from ?

At the centre of the earth, the temperature is too high that the magma is formed which is a mixture of gases and rocks which heats and boils at the earth centre with a very high temperature. When and volcanic eruption takes place this magma at the centre of the earth rises up to the creator and spreads out in a vicious orange liquid which is now called lava (not magma).Once the lava is cooled down the lava blackens and solidifies itself.

Some of the countries in this world do no have Volcano. Some of those countries  are South Africa, Nigeria, Zimbabwe, Malawi, Djibouti, Somalia, Algeria, Morocco, Tunisia, Liberia, Denmark and  Norway.