Match the following.
(i) Core (a) Earth's surface
(ii) Minerals. (b) Used for roads and
buildings.
(iii) Rocks. (c) made of silicon and
alumina.
(iv) Clay. (d) has definite
chemical
composition.
(v) sial. (e) innermost layer.
(f) changes into slate.
(g) process of
transformation of
the rock.