The element of the root chakra is the quality of solidity in other words the earth element.
The earth element gives us the quality of cohesive resistance and weight or solidness. At this level one has the experience of security and satisfaction in one s existing state and of being comfortable as one is, therefore there is no urge to move or change to another state. The earth element vibration gives one the experience of having one's feet firmly on the ground. It is a very real fact that at times when we feel insecure and nervous the vital currents are not earthed through our lowest center.
This chakra naturally governs all that is solid in the body such as the bones, teeth and nails. The sense of smell is associated with this level. All creatures that are very close to the earth have a strong sense of smell. We also see this in people; those who are very acute in material matters very often have prominent noses.