Earth History assessment 1

Front

What is an index fossil?

Back

An index fossil is a fossil that is used to define and identify a particular time period in the geologic time scale. It is typically widespread, abundant, and existed for a relatively short duration.

Tags

NGSS.MS-ESS1-4

Front

What geologic period is associated with trilobite fossils?

Back

Trilobite fossils are primarily associated with the Paleozoic Era, particularly the Cambrian to the Permian periods.

Tags

NGSS.MS-LS4-1

Front

What does the presence of trilobite fossils indicate about past environments?

Back

The presence of trilobite fossils indicates that the area was once covered by shallow marine environments, as trilobites were marine organisms.

Tags

NGSS.MS-LS4-1

Front

What is the significance of the Devonian period in Earth history?

Back

The Devonian period, often referred to as the 'Age of Fishes', is significant for the diversification of fish and the first appearance of amphibians.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Front

What is a half-life in radioactive decay?

Back

A half-life is the time required for half of the radioactive atoms in a sample to decay into a stable form.

Tags

NGSS.HS-PS1-8

Front

How can the rate of decay of a radioactive isotope be represented?

Back

The rate of decay can be represented graphically, showing the ratio of remaining radioactive atoms to the decay products over successive half-lives.

Tags

NGSS.HS-PS1-8

Front

What is a fault in geological terms?

Back

A fault is a fracture or zone of fractures in the Earth's crust along which movement has occurred.

Front

What does the term 'intrusion' refer to in geology?

Back

Intrusion refers to the process by which magma penetrates into pre-existing rock formations, solidifying into igneous rock.

Front

What is the relationship between rock layers and geological time?

Back

Rock layers are deposited over time, with the principle of superposition stating that in undisturbed layers, older layers are at the bottom and younger layers are at the top.

Tags

NGSS.MS-ESS1-4

Front

What evidence supports the theory of mass extinction events?

Back

Evidence such as iridium-rich layers in the geological record supports the theory of mass extinction events, indicating catastrophic events like meteor impacts.

Tags

NGSS.MS-LS4-1