Answer:
It is a pure substance. Magnesium is an element.
Answer:
gas molecules scatter short wavelengths of light (blue and violet) more than long (red and orange) so the sky looks blue. at sunrise and sunset, the light passes through thicker atmosphere and blue light is scattered more, so mostly red and orange light is visible.
Explanation:
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Answer:
A: rift
Explanation:
Divergent boundaries within continents initially produce rifts, which produce rift valleys.