Geological Time Scale and Mass Extinctions

Front

What classifies a mass extinction?

Back

Happens in a relatively short period of time and is global

Front

Which of the following is NOT an accepted criterion for a mass extinction event?
- The event must have occurred in a relatively short time frame.
- The extinction involves multiple lifeforms and is widespread.
- A significant part of life on Earth became extinct.
- The cause of the mass extinction must be obvious.

Back

The cause of the mass extinction must be obvious.

Front

Which of the following mass extinctions occurred first? Ordovician-Silurian, End Permian, Late Devonian, Cambrian

Back

Ordovician-Silurian

Front

Which of the following events resulted in the most species extinctions overall? Cretaceous-Tertiary, Ordovician-Silurian, End Triassic, End Permian

Back

End Permian

Front

What is another widely used name for the Cretaceous-Tertiary boundary?

Back

K-T boundary

Front

The Devonian extinction had the most effect on which community of species that were living at the time? Freshwater tetrapods, Terrestrial plants, Marine reef builders, Small mammals.

Back

Marine reef builders.

Front

The Geologic Time Scale is a record of what?

Back

The known history of rocks and fossils.

Front

Paleozoic, Mesozoic & Cenozoic are all

Back

Eras

Front

Which is the most recent era of time- the one that we are currently in?

Back

Cenozoic

Front

Which Eon or Eons were the longest in Earth history and the one geologist know the least about?

Back

Hadean, Archean, Proterozoic