Which numbered feature in this figure is the youngest?
A)the upper volcanic unit (1)
B)limestone (2)
C)sandstone (3)
D)metamorphic rocks (4)
E)granite (5)

Question

Which numbered feature in this figure is the youngest? 
A)the upper volcanic unit (1) 
B)limestone (2) 
C)sandstone (3) 
D)metamorphic rocks (4) 
E)granite (5)

Quizplus · Accepted Answer

The upper volcanic unit (1) is the youngest because it is on top of all the other rock formations. As a general rule, the layers on top are younger than the layers on the bottom in a geological formation.

Which Numbered Feature in This Figure Is the Youngest