The earths is a thin layer of rock that surrounds the earth

Atmosphere

Explanation: Our planet is surrounded by a layer of gases called the atmosphere. Without our atmosphere, there would be no life on earth.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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