There are many different types of root systems. The deepest roots are generally found in deserts and the deepest observed living root was found to be 60 metres! Some roots can grow as deep as a tree is high. The majority of roots on most plants are however found relatively close to the surface where nutrient availability and aeration are more favourable for growth. The main purpose of a root is that it anchors the plant to the earth and it also collects the water and nutrients necessary for plant growth.
It should come as no surprise that in spirituality the image of a root is often used. Everyone needs some anchor in life, something to hold us in place and something to keep us from falling over. People have tried lots of different things to keep us anchored. But there is nothing more effective or more important than a belief in a loving God, who is a constant anchor.