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Geological Time

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