How are intrusive igneous rocks formed? Earth Science Rocks Igneous Rocks 1 Answer Suryin =) Oct 20, 2015 Rocks formed deep within the earth is called intrusive rocks. Answer link Related questions What is basalt? How does crystal size relate to how long the rock took to cool? What is obsidian? What are some types of intrusive igneous rocks? What is rhyolite? What is granite? How are igneous rocks classified and differentiated from each other? Why igneous rocks are hard? Why do igneous rocks have crystals? Why are igneous rocks called primary rocks? See all questions in Igneous Rocks Impact of this question 3731 views around the world You can reuse this answer Creative Commons License