Answer : The correct option is, (a) the molten mixture of rock-forming substances, gases, and water from the mantle.
Explanation :
Magma : It is the molten or the semi-molten state or a mixture of natural material, gases and the water from which all igneous rocks are formed.
Magma is very hot liquid rock that is found below the surface of the earth. When it flows onto the surface of the earth then it is called as lava. There are three types of magma which are basaltic, andesitic and the rhyolitic.
The formation of magma from the melting solid rocks is controlled by the three parameters which are pressure, temperature and compositions.
Hence, the correct option is, (a) the molten mixture of rock-forming substances, gases, and water from the mantle.
