The illustrarion provides details how natural processes form stones.
Overall, the cycle of stone formation reapeat after eight steps, staring with volcanic eruption and ending with magma formation.
The starting point in the process is eruption of volcanoes 3 times annually. Next, contents of magma such as a granite and a basalit go through the process of cooling and solidification, before, weathering and erosion happen with stones in the first 7 months, wrecking them into smaller parts due to chemical and mechanical reasons. Once that is complete, small rock parts fall into the river with rain, then sediments of rocks tranfer with river and depose in river turns and cause shift of river flow.
Over time, layers of cements accumulate and form metamophic forms of stones. Subduction and melting of metamophic rocks occur under pressure 2400 atm and high tempature of 3200C, prior to magma formation which happens as a result of internal heat and tectonic movenments. After that, volvanoes erupt and cycle starts again.