Here's a breakdown:
* Igneous rocks are formed from the cooling and solidification of molten rock, either lava on the Earth's surface or magma underground.
* Lava is molten rock that has erupted onto the Earth's surface.
* Magma is molten rock that is still below the Earth's surface.
There are two main types of igneous rocks:
* Extrusive igneous rocks are formed when lava cools and solidifies on the Earth's surface. These rocks tend to have smaller crystals because they cool quickly.
* Intrusive igneous rocks are formed when magma cools and solidifies beneath the Earth's surface. These rocks tend to have larger crystals because they cool more slowly.
