Topic
Petrology
3 questions tagged Petrology — spanning every one of the seven Ws.
which
Which rock type is most abundant in Earth’s continental crust?
Granite-like rocks dominate the continental crust, while basalt is the main rock of the oceanic crust.
Earth SciencePetrology
why
Why do some rocks have layers?
Many rocks are layered because sediments were deposited over time in beds that later hardened into rock. Layers can also form in volcanic flows or by metamorphic banding.
Earth SciencePetrology
why
Why do some rocks show visible layers or bands while others do not?
Layers form when sediments settle over time or when minerals crystallize in stages. Metamorphic rocks can also band under intense heat and pressure.
Earth SciencePetrology