Soil is probably the most important keystone material we could ever possess. Why? Well because no nutrient cycles could go on without it. Sure we could probably have the water cycle and all, but think about phosphorous, nitrogen, sulfur, and other important nutrients. These are the basic components to build DNA and other particles needed for life. Plus, the soil decomposes animals and other decaying organisms and gives the nutrients that are passed on from the living to the dead. It's like food for our plants. And yes, talking about plants, as stated previously, we need them to survive. I don't know if you have seen the lion king, but it is very simple and even stated there. The circle of life, once something dies, it becomes part of the ground and becomes nutrients passed on to other organisms. It's basic ecology. If we didn't have soil, what could replace it? I mean sure, we now live in streets and houses, but it doesn't mean that it's not important. It will always be important.
Everything that is a part of this earth has importance in the environment/ecosystem. Without soil, how would plants and trees grow? Without plants and trees, how would we have oxygen? Without oxygen, how would we, as long with every other organism, survive? In soil lies nutrients that feed plants, trees, and organisms. The worms need soil to survive. Other animals need worms as a food source... It's all a part of the food chain that leads up to what is as humans consume....... It could go on and on about why soil is important lol but I really don't feel like writing an essay for you.
So whether you are living in a manssion and never actually see grass and whatnot, your food is/and was at once a process of many nutrient cycles and basically, the nutrients that you get from the food, once came from the soil.
Plants and trees require soil to grow, and humans eat produce from the plants/trees, or animals eat it to survive, then we eat the animals. :3 Sorry I'm not good at explaining things hahah.
Looks to me like you explained it well enough :)
You're welcome, thanks for the points :)