It would be that they are made from cooling of lava or magma because they form from magma underground unlike sedimentary rocks
I think it’s number 2 but I could be wrong, I know 1,3, and maybe 4 are in living things
It must be cooked and seasoned so I can eat it I’m hungry
The rock will only displace the same amount of water that the rock's volume is.
1mL = 1cm^3
400mL = 400cm^3.