They extrude to the surface of the Earth and and as they solidify they become harder and form a ignous rock. Some form below and some form above surface. The basalt are the surface one and the Granites are the intrusive ones.
No we do not have igneous rocks in Nigeria because there are no volcanoes in Nigeria and it is lava or magma that make igneous rocks.
Igneous rocks can be transformed not made but i think you are asking what types of rocks are igneous rocks well any rock that had once been lava/molten is an igneous rock and lava/molten comes from volcano.You might want to search on Google-types of igneous rocks or how can igneous rocks be transformed. From Ayushi:)
igneous rocks
Igneous Rocks, metamorphic rocks, and sedimentary rocks
lava
heat and pressure.
Rhyolititcen rocks.
Igneous rocks are formed by the solidification of molten materials.
Meta-igneous. Metamorphism of igneous rocks can form a wide range of metamorphic rocks, depending on the mineralogy of the igneous protolith and the P-T conditions of the metamorphism.
Sedimentary rock can be made up partially of igneous clasts, but igneous rock is igneous rock.
Sedimentary rocks make up about 75% of Earth's crust by volume, while igneous rocks make up about 15-20%. Sedimentary rocks form through processes like erosion, deposition, and cementation, while igneous rocks form from the cooling of molten magma.
pumice