Which of these applies if an igneous intrusion is observed going through a layer of sedimentary rock?
a. law of superposition
b. law of thermodynamics
c. law of uniformitarianism
d. law of crosscutting relationships

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