This rock may be formed from magma that hardens.

This will be called Igneous rock, because it is formed form magma that hardens.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

answer; the president uses mass media to gain support for policies;