Geologic Time: Subdivisions Question Preview (ID: 54779)


Practice On Eras And Other Subdivisions. TEACHERS: click here for quick copy question ID numbers.

More than 7/8th or 87% of the history of the Earth makes up this division of time
a) PreCambrian
b) Holocene Epoch
c) Mesozoic Era
d) Paleozoic Era

The largest subdivision of geologic time is the
a) Eon
b) Era
c) Period
d) Epoch

Dinosaurs were the dominant life form during this Era
a) Mesozoic
b) Paleozoic
c) PreCambrian
d) Cenozoic

The Cenozoic Era is also known as the Age of
a) Mammals
b) Dinosaurs
c) Fish
d) Bacteria

Why didn't Trilobites lives during the Mesozoic Era?
a) the Permian Extinction or the Great Dying
b) Oxygenation of the atmosphere
c) Iron deposits on the ocean floor
d) Coal deposits where great forests once lived

Humans arrived during this most recent Era
a) Cenozoic
b) Mesozoic
c) Paleozoic
d) PreCambrian

During this Era fish and other soft bodied organisms lived in ancient seas for hundreds of millions of years
a) Paleozoic
b) Mesozoic
c) Cenozoic
d) PreCambrian

Which Era contains the Jurassic, Triassic and Cretaceous Periods?
a) Mesozoic
b) Paleozoic
c) Cenozoic
d) PreCambrian

During which time period did the continents form, life thrived as bacteria in the newly formed oceans, and the atmosphere began to fill with oxygen
a) PreCambrian
b) Paleozoic
c) Cenozoic
d) Mesozoic

Which Era ended with the greatest mass extinction in the history of Planet Earth, killing off nearly 95% of species?
a) Paleozoic
b) Mesozoic
c) Cenozoic
d) PreCambrian

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