Final answer:
Water enters the atmosphere through evaporation, sublimation, and transpiration processes in the water cycle.
Step-by-step explanation:
Water enters the atmosphere through a process called the water cycle. There are several ways in which water enters the atmosphere:
- Evaporation: Liquid water evaporates from lakes, streams, and other bodies of water when heated by the Sun's energy.
- Sublimation: Frozen water, such as ice and snow, can change directly into water vapor without melting.
- Transpiration: Plants release water vapor through small pores called stomata on their leaves, a process known as evapotranspiration.
All of these processes contribute to the continuous movement of water between the Earth's surface and the atmosphere in the water cycle.