Here's a breakdown:
* Igneous comes from the Latin word "ignis", meaning "fire".
* Magma is molten rock found beneath the Earth's surface.
* Lava is molten rock that has erupted onto the Earth's surface.
Igneous rocks can be further classified into two main types:
* Intrusive igneous rocks: Formed when magma cools and solidifies slowly below the Earth's surface. These rocks are generally coarse-grained, meaning the crystals are large enough to be seen with the naked eye. Examples include granite and gabbro.
* Extrusive igneous rocks: Formed when lava cools and solidifies quickly on the Earth's surface. These rocks are typically fine-grained, meaning the crystals are too small to be seen without a microscope. Examples include basalt and obsidian.
