It will be rock hard.
Yes, use epoxy.
The general composition of a soil sample will be some sand, some silt, some clay, and some organic matter, plus a certain amount of microbial life, air and (unless it's completely dried out) some water.
Add water to it.
Yes, certain types of clay can dissolve in water. These types of clays are not fired, non oil based clays, but natural and air dried clays.
I have never heard of clay exploding unless your talking about the way clay explodes when its in a kiln for art purposes. In that case its not really the clay exploding, but the air bubbles inside of it becoming too great in pressure that the clay "pops" like a bubble letting the air out and leaving a mess.
Yes, use epoxy.
Air dry clay can crack easily if it is not handled or dried properly.
A dried clay cannot be classified as a rock
Clay that is burnt is stronger than clay that has just been dried in the air.
To fix cracked or dried out air dry clay, you can try moistening it with water or a mixture of water and glue, then kneading it until it becomes pliable again. You can also try wrapping the clay in a damp cloth and letting it sit for a few hours to absorb moisture.
Paper Clay is any clay fine enough for an artist to use, and cellulose (paper) fibres added to give strength to and reduce the weight of the clay. The finished object is air-dried.
"Caked clay" refers to clay that has dried out and hardened, typically forming a hard layer on the surface. It can be difficult to work with and often requires rehydration to make it pliable again for sculpting or pottery.
Air dry clay can crack due to a few reasons, such as not being properly kneaded or dried, being too thin or thick, or drying too quickly. These factors can create stress on the clay, leading to cracks as it dries.
Dried clay
Yes, you can use acrylics on clay after the clay has been dried.
To fix cracks in air dry clay, you can try moistening the clay slightly with water and then gently smoothing over the cracks with your fingers or a clay tool. Allow the clay to dry completely before sanding or painting over the repaired area for a seamless finish.
The general composition of a soil sample will be some sand, some silt, some clay, and some organic matter, plus a certain amount of microbial life, air and (unless it's completely dried out) some water.