Law of Superposition

Front

What is the Law of Superposition?

Back

The Law of Superposition states that in any undisturbed sequence of rocks, the oldest layers are at the bottom and the youngest layers are at the top.

Front

Which rock layer is typically the oldest in a sequence?

Back

The oldest rock layer is found at the bottom of the sequence.

Front

What does it mean if a rock layer is disturbed?

Back

If a rock layer is disturbed, it may have been affected by geological processes such as folding, faulting, or intrusion, which can alter the original order of the layers.

Front

What is a fossil?

Back

A fossil is the preserved remains or traces of ancient organisms, often found in sedimentary rock.

Front

How can fossils help determine the age of rock layers?

Back

Fossils can indicate the relative age of rock layers based on the principle of faunal succession, where certain fossils are known to appear in specific geological time periods.

Front

What is an intrusion in geology?

Back

An intrusion is a body of igneous rock that forms when magma pushes into pre-existing rock layers and solidifies.

Front

What is a fault?

Back

A fault is a fracture in the Earth's crust along which movement has occurred, often resulting in the displacement of rock layers.

Front

What is the significance of the youngest layer in a rock sequence?

Back

The youngest layer is significant because it represents the most recent geological events and conditions that have occurred in that area.

Front

What is the role of sedimentary rock in understanding geological history?

Back

Sedimentary rock layers provide a record of past environments, climate changes, and biological evolution over time.

Front

What is the principle of original horizontality?

Back

The principle of original horizontality states that layers of sediment are originally deposited horizontally under the action of gravity.