In the 1890's national land policy in the United States focused on making permanent federal control over some lands. It was a shift towards conservation and the Forest Reservation Act of 1891 set...
actually rocks can be made of other rocks ,such as sedimentary rocks.
Badlands National Park is made up of poorly lithified siltstones and mudstones.
Granite.
They are made of wood or metal. The ground might be grass.