Mass extinctions and Fossils

Front

What are fossils?

Back

Fossils are traces or remains of organisms that lived long ago.

Front

What type of rock is formed from magma that intrudes into other rocks?

Back

Igneous rock.

Front

What is the order of relative ages from oldest to youngest: Limestone, Siltstone, Fault, Basalt?

Back

Limestone, Siltstone, Fault, Basalt.

Front

What is the term for the time it takes for 50% of a radioactive isotope to decay?

Back

The half-life.

Front

Which is older: Layer E or Intrusion A?

Back

Intrusion A.

Front

What is a mass extinction?

Back

A mass extinction is a rapid and widespread decrease in the biodiversity on Earth, where a significant number of species become extinct in a relatively short period.

Front

What is the significance of fossils in understanding Earth's history?

Back

Fossils provide evidence of past life forms and help scientists understand the evolution of species and changes in the environment over time.

Front

What are sedimentary rocks?

Back

Sedimentary rocks are formed from the accumulation and compaction of mineral and organic particles, often in layers.

Front

What is the principle of superposition?

Back

The principle of superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.

Front

What is an intrusion in geology?

Back

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