Metamorphic rocks are formed deep in the crust when igneous and sedimentary rocks are changed by heat and the weight of the crust pressing on them.
(Metamorphic rocks; are formed; L:deep in the crust; T:when igneous and sedimentary rocks are changed by heat and the weight of the crust) (igneous and sedimentary rocks; are changed; by heat and the weight of the crust) (the crust; pressing; on them)
Metamorphic rocks igneous and sedimentary rocks the crust
are formed are changed pressing
L:deep in the crust T:when igneous and sedimentary rocks are changed by heat and the weight of the crust
by heat and the weight of the crust
on them