What do pumice and scoria have in common?

Cross-section_of_sedimentary_layers.png In the picture, which letter would be the youngest?

You have 7/8ths of the original uranium 238 left in the rock.  How old is it?

Diagram 1.jpg Which rock is the oldest?

Diagram 1(1).jpg What type of unconformity is present?

Sediments play a big part in making which fossils?

Two common metamorphic rocks that typically lack foliation are __________ and __________.

Which of the following is an example of fossil succession?

Which geologic principle states that the oldest rocks are at the bottom in a sequence of undisturbed rocks?

Your rock contains Carbon 14 and is 22,920 years old.  How many half lives went by?