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It is the displacement method.
It would be hard to find a line of symmetry on a moon, as it is likely to be irregularly shaped.
Google "Archimedes' Principle" and see if that gives you a clue...
Mass divided by Volume = Density. Or use the displacement method for an irregularly shaped object.
The apple was irregularly shaped
The volume of an irregularly shaped solid can be measured by placing the solid in a known quantity of water in a container with measurement markings. Take the new volume and find the difference between this and the old volume. This is the volume of your irregularly shaped solid.
Finding the center of gravity of an irregularly shaped object can be done using the plumb line method.
Poikilocyte
Irregularly shaped pieces of rock, metal, and dust found in space are called asteroids. They are remnants from the formation of the solar system and can range in size from small pebbles to hundreds of kilometers in diameter.
square
batholiths
Lump
A lump
Tight
batholiths
a sharply elevated, irregularly shaped, progressively inlarging scar