What are the four spheres of Earth?
The first sphere is the lithosphere, which is the hard part of Earth's surface (e.g. rock, soil...). The second is the hydrosphere, which is the liquid part of Earth's surface (e.g. salt water oceans, freshwater lakes...). The third is the atmosphere, which are the layers of gases above Earth's surface, such as air. The last sphere is the biosphere, the living part of Earth's surface; not separated from other abiotic spheres. This includes life in soil, water and air.