Here's a breakdown:
* Igneous rocks are formed from the cooling and solidification of magma (molten rock beneath the Earth's surface) or lava (molten rock that has erupted onto the Earth's surface).
There are two main types of igneous rocks based on their formation:
* Intrusive igneous rocks form when magma cools and solidifies beneath the Earth's surface. They often have large crystals because they cool slowly. Examples include granite, diorite, and gabbro.
* Extrusive igneous rocks form when lava cools and solidifies on the Earth's surface. They often have smaller crystals because they cool quickly. Examples include basalt, rhyolite, and obsidian.
Examples of igneous rocks formed by volcanic activity:
* Basalt: A dark-colored, fine-grained volcanic rock that is very common.
* Rhyolite: A light-colored, fine-grained volcanic rock that is often found in areas with explosive eruptions.
* Andesite: An intermediate-colored volcanic rock that is common in volcanic arcs.
* Obsidian: A black, glassy volcanic rock that forms when lava cools very quickly.
* Pumice: A light and porous volcanic rock that is formed from frothy lava.
* Scoria: A dark, vesicular volcanic rock that is often used in landscaping.
So, remember, any rock formed from volcanic activity is an igneous rock, but there are many different types based on their composition and how they were formed.
