Answer:
1. Rocks in Earth's mantle and crust melt due to extreme temperatures and turn into magma.
2. Hot magma erupts as lava above Earth's surface during a volcanic eruption.
3. Being exposed to a cooler temperature, the lava starts to cool down quickly.
4. The lava solidifies into a rock formation with a fine-grained or smooth surface.
Step-by-step explanation:
Igneous rocks (also called magmatic rocks) are rocks formed in the process of solidification of magma or lava. Igneous rocks formed above Earth's surface are referred to as extrusive, while those formed below the Earth's surface are referred to as intrusive.
There are several types of extrusive igneous rocks: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff.
When lava cools down too quickly, volcanic glass is created.