The relative age of a rock is

The law of superposition states that, in horizontal layers of sedimentary rock, each layer is i

What is the age of an intrusion of igneous rock in relation to the sedimentary rock layers through which it passes?

A rock layer's ___________ age is its age compared to the ages of other rock layers.

A(n) ___________ is a gap in the geologic record where some rock layers have been lost because of erosion.

The _________ age of a rock is the number of years since the rock formed.

Lava that hardens on a surface is called an

An _________ is when the magma cools and hardens into a mass of igneous rock.

A(n) _________ fossil is a fossil that must be widely distributed and represent a type of organism that existed only briefly.

Index fossils are useful because they tell the ______________ __________ of the rock layers in which they occur.

The study of rock layers is called

A break in the Earth's crust caused by forces inside the Earth is called a(n)

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