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Geologic Time Scale Vocabulary Quiz

Across
What was the name of the continent formed during the Permian Period?
Vertebrate that lives part of its life o land and part in the water.
A smaller unit of time that Eras are divided into.
Animal without a backbone
A record of the life forms and geologic events in Earth's history.
Many types of living things die off at the same time.
Three long units of time that geologists divide the time between the Precambrian and present day.
Down
Scientist who studies fossils
A warm-blooded vertebrate that feeds its young milk.
During what period of the Mesozoic Era did the first birds appear?
Vertebrate with scaly skin that lays eggs.
The process by which continents move very slowly over Earth's surface because of forces inside of Earth.
Animal with a backbone.
A ball of dust and ice that orbits the sun.