Earth's History Practice

The preserved remains of a living thing

• fossil

• mold

• cast

Index fossils

• can tell the exact age of a rock layer

• can identify the relative age of a rock layer

• were present in the Age of the dinosaurs

Occurs when many species die out at the same time

• index fossils

• drought

• mass extinction

A giant continent that existed in Earth's past

• Africa

• Pangaea

• Asia

A geologic chart that divides Earth's history into units

• epochs

• geologic time scale

• milleniums

All of the fossils in Earth's rock layers

• trace fossils

• fossil record

• trilobites

States that younger rocks lie above older rocks if the layers have not been disturbed

• Law of crosscutting
• Law of superposition
• Relative Dating
• Unconformity

How does the law of crosscutting explain the age of a fault?

• The fault is younger than the rocks above it.
• The fault is younger than the rocks it cuts through.
• The fault is older than the rocks above it.
• The fault is older than the rocks it cuts through.

What are the relative ages of the features in order from oldest to youngest?

• Limestone, Basalt, Fault, Siltstone
• Siltstone, Fault, Basalt, Limestone
• Limestone, Fault, Basalt, Siltstone
• Limestone, Siltstone, Fault, Basalt

The rock formation labeled "P" is a(n)...

• fault
• intrusion
• inclusion
• unconformity