The document discusses the water cycle and various components of Earth's hydrosphere. It explains that water evaporates from bodies of water due to the sun's energy, rises into the atmosphere as vapor, cools and condenses to form clouds, and falls back to Earth as precipitation. The cycle involves surface water runoff into streams, rivers and oceans. Groundwater is water that soaks into the ground and collects in soil and rock pores. Tides are caused by the gravitational pull of the moon and sun, forming bulges in the oceans.