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Comets are cosmic snowballs of frozen gases, rock and dirt that orbit the Sun. once frozen, they're the dimensions of a small city. when a comet's orbit brings it about to the Sun, it heats up and spews dirt and gases into an enormous glowing head larger than most planets.
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Answer:
Open-pit mining involves extracting minerals such as coal from Earth’s surface. It harms the environment by releasing radioactive materials, toxic minerals, and metallic dust into the air. It also produces toxic liquid mixtures called slurries, which contain pollutants that cause soil erosion and blanks water pollution.
Explanation:
Just took the test ;)
