Geologic Time Unit Review

Front

What does the law of superposition state?

Back

In a sequence of undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest are at the top.

Front

Where are the oldest fossils typically found?

Back

Near the bottom of the rock layers.

Front

What indicates that a volcanic eruption occurred when found in an ice core?

Back

The presence of volcanic ash.

Front

Which is older: Fault E or Intrusion D?

Back

Intrusion D is older than Fault E.

Front

What is an ice core?

Back

A drilled section of ice that helps determine past climates.

Front

What is the significance of Layer E in geological studies?

Back

Layer E is identified as the oldest layer in a given sequence.

Front

What can volcanic ash in an ice core tell us about Earth's history?

Back

It indicates that a volcanic eruption occurred during the time the ice was formed.

Front

What is the principle of original horizontality?

Back

Layers of sediment are originally deposited horizontally under the action of gravity.

Front

Define 'intrusion' in geology.

Back

An intrusion is a body of igneous rock that has formed from magma that has cooled and solidified within the Earth's crust.

Front

What is a fault in geological terms?

Back

A fault is a fracture or zone of fractures between two blocks of rock.