3types of spheres of the earth and activities that occur in each

The Geosphere - meaning 'ground', types of rocks, like mountain rocks, as wells as liquid rock in the mantle below us, the minerals and metals of the outer and inner core, all the continents on the oceanic floor.

The Hydrosphere - meaning 'water', any type of water, like rivers, ocean, lakes, streams, groundwater, polar ice caps, glaciers and moisture in the air like the snow and rain.

The Biosphere - meaning 'life', all the living organisms on the planet, like animals, plants, bacteria, fungi, all of these are on the earth or no deeper then 10 feet into the ground or about 600 feet above.

---

There is actually another one and it's

The Atmosphere - meaning 'air', any type of air that surrounds the earth and that floats in earth, like oxygen the one we breath and plants give out, carbon dioxide which plants breath in.

You chose which one is the most important one