Is Obsidian Intrusive Or Extrusive

Question: List the layers of the earth in order from the outer one which we live to it’s centre

Answer: crust

mantle

core

Question: name the layers that make up the lithosphere

Answer: the upper part of the mantle is like the crust it is rigid. crust and mantle share similar properties so the crust and the upper mantle are known as the lithosphere

Question: name the layers that make up the atheosphere

Answer: The ‘plastic’ layer of the mantle is known as the athenosphere.

Question: name two igneous rocks that are extrusive

Answer: basalt has small visible crystals

obsidian is an example of a extrusive rock with no crystals it is often called volcanic glass it cools too fast for any crystals to form.

Question: name two igneous rocks that are intrusive

Answer: granite and dolerite