Explanation:

• Magma forms in the deeper layers of the earth where temperatures are so hot that rocks melt. This melted rock, or magma, is less dense than the rock surrounding it, allowing it to rise toward the earth's surface. Some of this rising magma finds its way to the inside of volcanoes, yet you do not see it until it comes out of the volcano as lava. In other words, magma is hot molten rock in the middle of a volcano, and lava is hot molten rock leaving a volcano.
• This differentiation between magma and lava is important when we consider the two classifications of igneous rock. This is because plutonic rocks are rocks formed when magma cools and solidifies below the earth's surface, and volcanic rocks are rocks formed when lava cools and solidifies on the earth's surface.
• In short, Plutonic rocks are igneous rocks that solidified from a melt at great depth. Magma rises, bringing minerals and precious metals such as gold, silver, molybdenum, and lead with it, forcing its way into older rocks. Hence option 1st is correct.