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Geologic Time Scale Crossword Puzzle

Across
A ball of gas, dust, and ice that orbits the sun.
The process by which bacteria use inorganic chemicals to make food energy.
The record of the geologic events and evolution of life on earth.
A vertebrate that lives part of its life on land and part of its life in water; its body temperature is determined by the environmental temperature.
A subdivision of time within an era.
An animal without a backbone.
Animals with jointed legs and many body segments.
Down
A region of Earth's atmosphere where ozone molecules absorb most of the Sun's ultraviolet (UV) radiation.
A vertebrate whose body temperature is determined by the environmental temperature, has lungs and scaly skin, and lays eggs with thick shells on land.
An animal with a backbone.
The process by which plants use the Sun's energy (light) to make food energy.
An event in which many (>50%) species of life become extinct at the same time.
A vertebrate that can control its body temperature, has skin with hair, and feeds milk to its young.
One of three very long units of geologic time between Precambrian time and the present.