Geologic Time

Front

What is the youngest rock layer in a geological diagram?

Back

Layer C is the youngest rock layer.

Front

The science and study of the physical structures and history of the Earth, especially as can be learned from rocks is: _____________

Back

Geology.

Front

Most fossils form in _______ rocks.

Back

Sedimentary rocks.

Front

Stratigraphy is the study of __________.

Back

Rock layers and layering.

Front

What is a bed or LAYER of sedimentary rock having approximately the same composition throughout?

Back

Rock strata.

Front

What principle states that in undisturbed layers of rock, the oldest layers are at the bottom?

Back

Law of Superposition.

Front

What is the geologic time scale?

Back

A timeline that organizes Earth's history into different periods based on geological and biological events.

Front

What type of rock is formed from cooled magma or lava?

Back

Igneous rock.

Front

What is the process by which sediment is compacted and cemented to form sedimentary rock?

Back

Lithification.

Front

What are fossils?

Back

Remains or traces of ancient organisms preserved in rock.