planting crops is a kind of activity & planting is a kind of human action ->  planting crops is a kind of human activity  planting crops is a kind of human activity & planting crops requires growing crops ->  growing crops is a kind of human activity  soil contains nutrients for plants & a plant / living thing requires nutrients to grow ->  a plant requires nutrients in soil to grow  a plant requires nutrients in soil to grow & crops are a kind of edible plant for eating ->  crops require nutrients in soil to grow  crops require nutrients in soil to grow & if something requires something else then that something relies on that something else ->  crops rely on nutrients in soil to grow  crops rely on nutrients in soil to grow & high quality / rich / good soil has a high number of nutrients / amount of nitrogen ->  crops rely on high quality soil to grow  growing crops is a kind of human activity & crops rely on high quality soil to grow -> growing crops is a kind of human activity that relies on high quality soil to grow