Rock Layers & Geologic Time Assessment

Front

The geologic time scale tracks Earth’s _________ year history:

Back

4.6 billion

Front

Remains, imprints or traces of once-living organisms are called:

Back

Fossils

Front

Order the divisions of geologic time from the longest to the shortest:

Back

Eons, Eras, Periods

Front

Rock that is made from sediment that has been pressed together is called:

Back

Sedimentary rock

Front

Which fossil would make the best index fossil?

Back

Frog

Front

What is an index fossil?

Back

A fossil that is used to define and identify a particular time period in the geologic time scale.

Front

What are the three main types of rocks?

Back

Igneous, Sedimentary, Metamorphic

Front

What is the process of sedimentary rock formation?

Back

Sedimentation, compaction, and cementation of sediments.

Front

What is the principle of superposition?

Back

In undisturbed rock layers, the oldest rocks are at the bottom and the youngest are at the top.

Front

What is an eon?

Back

The largest division of geologic time, lasting hundreds of millions to billions of years.