
The relationship between mass of matter per unit volume is known as :

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Well i know water is made out of 2 but gold is made of 1 type of atom if that helps
I'm assuming you are supposed to complete the given statement? In a water molecule, the bonds between the hydrogen and oxygen atoms are polar covalent bonds, where electrons are unequally shared. (Oxygen is significantly more electronegative and holds onto the electrons for most of the time)
Answer:
Magma hot spot.
Explanation:
Hot spots stay always the same location because they are in the mantle, not in the crust. So, that's why hotspots stay while plates are moving over them.