Steel because it is a physical combination of different metals.
Answer:
What do you think causes some rock types to have higher densities than others? (Assuming there are no air pockets in the rock, the types of minerals will determine the density. Granite contains lots of quartz and feldspar - both fairly light minerals, whereas basalt and gabbro are made of heavier minerals.)
Explanation:
1 = Salt
2 = Lead
3 = Magnesium
4 = Silver
Which question are you confused about?
