The first sphere that is explained is the Lithosphere. The Lithosphere is what makes earth earth . Without the Lithosphere the other spheres would not be spheres.
The second sphere is the Biosphere. The biosphere is all living things on earth. Without the biosphere people, plants/ animals or anything that is living would not be on earth.
Another sphere that makes earth is the hydrosphere. Hydro is a Greek word for water so water is important for our health and if we don´t drink water we die.
The last part of the spheres is the atmosphere. The atmosphere is like Evaporation. Evaporation is part of the atmosphere because the heat transfer goes through the atmosphere to create the water from bodies of water to evaporate and the heat transfer is the sun