Marble is formed through the metamorphism of limestone, and/or dolomite.
Take a look at the related link I have included below. It is very informative and explains how marble rock is formed and what it comprises of.
Sand and marbles would not be a solution. A solution has a solute (a solid) and a solvent (a liquid). You must also not be able to just separate the two. Sand and marbles would not be a solution because you can simply pick out the marbles, and there is no solvent!
He will have 13 blue marbles and 10 green marbles.
10 Green marbles, 13 Blue marbles.
Moqui marbles are formed by a natural geological process where iron-rich minerals precipitate around a nucleus, usually a sand grain or shell fragment, creating a concretion. Over time, additional layers of mineral deposits accumulate around the nucleus, eventually forming the spherical shape of a moqui marble.
Glass marbles are typically made of melted glass that is formed into spherical shapes. They can come in various colors and patterns, created by adding different pigments or layers of glass during the manufacturing process. Glass marbles are often smooth and shiny due to the way they are molded and cooled.
He has 10 green marbles.
Marbles ARE solid.
There could be 12 white marbles and 16 red marbles
at least 39 blue marbles
8:6
12 blue marbles