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Your rock is 40 million years old.  The half life of the isotope is 5 million years.  How many half-lives have gone by?

A batholith is a

Compared with mafic igneous rocks, all felsic igneous rocks

Which of the following is a common foliated metamorphic rock?

Diagram 3.jpg What type of unconformity is present here?

Which of the following minerals is a polymorph of diamond?

A fine-grained clastic sedimentary rock that splits into thin sheets is

Garnet schist, which formed from shale (both pictured below), expresses which key feature of metamorphic rocks.?

In the photo below, what type of igneous intrusion is indicated by the arrow?

Radiometric dating works best with which kind of rock?