Earth History

The age of a rock compared to the ages of other rocks.

• relative age
• half-life
• absolute age
• radioactive decay

The process in which the nuclei of radioactive elements break down, releasing fast-moving particles and decay at a fixed rate

• relative age
• half-life
• absolute age
• radioactive decay

The time it takes half of the atoms of a radioactive element to decay

• relative age
• half-life
• absolute age
• radioactive decay

A gap in the geologic record that shows where rock layers have been lost due to erosion.

• extrusion
• unconformity
• intrusion
• law of superposition

The Law of Superposition helps scientists to determine what?

• The absolute age of rock layers
• The age of fossils
• The relative age of rock layers
• the super powers of rocks

According to the law of superposition, which layer is the youngest?

• A
• B
• C

Paleozoic, Mesozoic & Cenozoic are all

• Epochs
• Eras
• Periods
• Eons

Known as the age of the mammals?

• Mesozoic Era
• Holocene Epoch
• Cenozoic Era
• Cambrian

The dinosaurs and reptiles were dominant in which Era?

• Precambrian
• Mesozoic
• Paleozoic
• Cenozoic

Which era began with the early invertebrates, such as trilobites and brachiopods.

• Paleozoic

• Mesozoic

• Cenozoic