Answer :
these substances could be rock particles and we can get them by digging the earth's surface to get them
Answer:
A planet is subdivided into several layers and the mantle is one of those layers. It is located above the crust and below the core. The mantle is the most massive and bulky solid of the Earth’s layer. It is mostly made up of ice and rock. The other two layers are core and crust. The substances that we can study from the mantle can be rocks that can be obtained while digging in the earth’s surface.