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Geological Time

Across
One of the units of geologic time into which geologists divide eras.
A vertebrate whose body temperature is determined by the temperature of its environment, and that lives its early life in water and its adult life on land.
A record of the geologic events and life forms in Earth's history.
An animal without a backbone.
A loose collection of ice and dust that orbits the sun, typically in a long, narrow orbit.
Down
A vertebrate whose temperature is determined by the temperature of its environment, that has lungs and scaly skin, and that lays eggs on land.
One of the three long units of geologic time between the Precambrian and the present.
When many types of living things become extinct at the same time.
An animal with a backbone.
A vertebrate whose body temperature is regulated by its internal heat, and that has skin covered with hair or fur and glands that produce milk to feed its young.