The suksma bhutas combine in different proportions with the radical as its material cause and other bhutas as the efficient cause to form the Mahabhutas; atoms and suksma bhutas cannot exist in the phenomenal state in an uncombined form.
22.
Most are gases at room temperature; have relatively low densities; are poor electrical and thermal conductors; have relatively high ionisation energies and electronegativities; form acidic oxides; and are found naturally in uncombined states in large amounts.
23.
These silicates were of relatively lower density than iron, nickel, and other metals non-reactive to oxygen, and a residuum of uncombined metallic iron and nickel sank to the planet's core, leaving a thick mantle of mostly of magnesium and iron silicates between core and crust.