Answer :
The process that leads to igneous rock is the eruption of a volcano and is also the start of primary succession. But igneous rock is cooled lava so igneous rock is caused by the eruption of a volcano
The process which leads directly to the formation of igneous rock is; The cooling and Solidification of magma (otherwise called lava)
Definition;
Igneous rocks form when magma (molten rock) cools and crystallizes/solidifies, either at volcanoes on the surface of the Earth or while the melted rock is still inside the crust.
All magma develops underground, in the lower crust or upper mantle, because of the intense heat there.
Igneous rocks are diverse in their compositions, depending on the magma they cool from.
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