Igneous rocks

Igneous rocks are fine formed rocks due to vulcanicity.

Characteristics of igneous rocks

• They are crystalline in structure
• They do not contain
• Some are spongy in nature such as
• Some are dark coloured such as Basalt
• They do not occur in layers/strata
• Some are acidic, basic and intermediate in chemical composition. Etc.

Examples of igneous rocks include; Quam, Gabbro, Pumice, Basalt, Obsidian, Dolerite, diorite etc.