Geologic Time Scale

Front

Which era is the longest?

Back

Precambrian

Front

What time period do we live in?

Back

Cenozoic Era

Front

Dinosaurs, small mammals, and birds are found in this time period.

Back

Mesozoic

Front

Marine plants and invertebrates were abundant during which era?

Back

Paleozoic

Front

Which extinction is considered the largest mass extinction in Earth's history, where 96% of all species on Earth disappeared?

Back

Permian Extinction

Front

The dinosaurs went extinct in the __________ Mass extinction.

Back

Cretaceous-Tertiary (K- Pg)

Front

A species that no longer exists is said to be _______________.

Back

extinct

Front

There have been 5 mass extinctions in Earth's history. Which of the following mass extinctions occurred first? Options: End Permian, Triassic, Late Devonian, End Ordovician

Back

End Ordovician

Front

A comet or asteroid impact on the earth is a frequently suggested cause for many of the mass extinctions. For which of the major mass extinctions does the most evidence exist that this was the main trigger for the event?

Back

Cretaceous (KT Event)

Front

The environmental changes at the very end of the Devonian period significantly impacted shallow warm waters. Which community of species living at the time would have been most impacted?

Back

fish and corals