The property of all ionic compounds that makes chalk particularly useful for writing on a chalkboard is : Hardness and Brittleness
Those properties make chalk leaves residues on the board every time friction happen between the chalk and the board
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I’m going to guess false srry if I’m wrong
I believe the correct answer is d.
Because that's the starting tempture to rising. for example if your body temperature starts naturally at 80°, as the weather changes your tempture it increases or decreases as it goes.
Overhunting of large mammals.