Va Provinces, Geological Time, Resources

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

• 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

An igneous rock later formed when lava flows onto Earth's surface and hardens.

• extrusion
• index fossil
• intrusion
• uncomformity

Fossils of widely distributed organisms that lived during a geologically short period.

• index fossil
• half-life
• radioactive dating
• geologic time scale

In horizontal layers of sedimentary rock, each layer is older than the layer above it.

• mass extinct
• geologic time scale
• era
• law of superposition

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

• extrusion
• unconformity
• intrusion
• law of superposition

Fossils of widely distributed organisms that lived during a geologically short period.

• index fossil
• half-life
• radioactive dating
• geologic time scale

Which segment of time is the smallest?

• Eon

• Era

• Period

• Epoch

Karst topography includes underground caverns. Where in VA would this landscape be found?

• Piedmont 
• Coastal Plain
• Valley and Ridge
• Blue Ridge

The Fall Line is the natural border between which two regions?

• Appalachian Plateau & Valley & Ridge
• Blue Ridge & Coastal Plain
• Coastal Plain & Piedmont
• Blue Ridge & Piedmont