Earth

MonoMonday and the theme is Earth as an element.  
"The basis and foundation of all the elements is the Earth.  The Earth is the object; subject and receptacle of all celestial rays and influences and in it are the seeds of all things.  It is made fruitful by the other elements and the heavens and brings forth all things of itself.  It is the first fountain from whence all things spring. It is the center, foundation and mother of all things." 
thewhitegoddess.co.uk

Earth is often physically thought of as rock, stone, sand and the ground we stand on, the dirt.  

 Thanks to notowennewitt for hosting.  It was really interesting looking for this information and tying a photo in with it.