These are made from a hydrogel, a super-absorbent polymer, Sodium Polyacrylate, formed into round balls that are available in various colors and sizes*. They can absorb more than 200 (some say 800) times their weight in water.
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* This material is available in various shapes, as well. Most commonly, the round shape in a variety of colors, is used by gardeners who wish to water their plants, especially house plants, in artistic and practical ways. This material slowly meters its stored water to plant roots, eliminating the need for daily watering. From time to time, a gardener simply adds water enough to keep the marbles plumped.
Because the marble has a higher density than the water does
Because marble sinks in water.
Yes. Raw marble (untreated marble) will absorb water. However this doesn't mean it will absorb so much water it will have a significantly larger mass. Treated marble that has a thin silicon layer will not absorb water.
yes it is because it does not absorb water. <><><><> Above is not quite correct. Marble is water resistant. Different grades of marble have different rates of water absorption. One major US building was skinned with marble, and had to be redone- the marble selected was the wrong grade, absorbed more water than was covered in the design, and marble panels were bowing away from the framework. It does not absorb water like wood, but it DOES absorb some water.
No because the marble was just added to make the water level rise
If you combine it with an acid, it will react and release a small amount of water but the marble will be destroyed completely.
The marble will sink.
No
Limestone and Marble Limestone and Marble
drop the marble in water and then see how much the water went up
Ii HAVE USED MILK ON MARBLE AND WOOD WATER STAINS.
All of the above? You can say the same thing in many ways. All of the following are different ways of saying the same thing, and all are correct: The marble sinks because the marble weighs more that an equivalent volume of water. The marble sinks because its density is greater than the density of water. The marble sinks because it has a greater mass than than same volume of water (and there is gravity/acceleration).