What does hertzsprung-russell diagram display?

answer: the answer is b

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

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