The rock cycle describes how rocks change. What conditions must be present for igneous or sedimentary rock to change into metamorphic rock? Name two ways that this could happen.​

How many types of rock can form from the rock cycle

9. the history of life on earth is recorded in

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers