Since this is not my area of expertise, I searched Google under the key words "value of igneous rocks" to get these possible sources:
https://www.google.com/search?client=safari&rls=en&q=value+of+igneous+rocks&ie=UTF-8&oe=UTF-8
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
Don't just copy the material. Express the ideas in your own words. Although this will take more time and effort, you will learn more.
what is the value of igneous rocks to humankind?
4 answers
igneous rocks to Hunan kind
I want to know that what is the value of igneous rock to humankind
What is the value of igneous rock to human