Intrusive means it was formed in Earth's surface. Extrusive means it was formed on Earth's surface
what does intrusive means ?
Extrusive and intrusive are terms that apply to a type or formative method of igneous rock. Magnetite is not igneous, nor is it a rock. Magnetite is a mineral, formed by the processes of...
intrusive
Tuff is EXTRUSIVE. It forms when it cools as it is ejected from volcanic vents.