what phase of matter is the mantle
Rating Newest Oldest. Best Answer: The crust and inner core are solid. The mantle is a solid-plastic. It's solid, but you can move it around. However, when you move it, it stays that way, which means plastic instead of being a liquid that would just rebound to the way it had been.The outer core is liquid but not like water sloshing around.A very thick liquid.he mantle is a solid-plastic. It's solid, but you can move it around. However, when you move it, it stays that way, which means plastic instead of being a liquid that would just rebound to the way it had been. The outer core is liquid but not like water sloshing around. A very thick liquid.