Most meteors do not have enough mass for gravitational force to compress them into a sphere, so they maintain irregular shapes.
Because they are just small to medium size rocks. They are not large enough for gravity to shape them into spheres, like the Moon etc
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.
batholiths
Finding the center of gravity of an irregularly shaped object can be done using the plumb line method.
Poikilocyte
square
batholiths
Lump
A lump
Tight
Frank Stella.