Final Answer:
The two processes that involve water in a liquid state are melting and freezing. are
a) Melting
e) Freezing
Step-by-step explanation:
The two processes that involve water in a liquid state are melting and freezing.
1. **Melting (Option a):** Melting is the process by which a substance transitions from a solid to a liquid state. In the case of water, this occurs when ice (solid water) is heated, absorbing energy and changing into liquid water.
2. **Freezing (Option e):** Freezing is the opposite process of melting. It involves the transition of a substance from a liquid to a solid state. In the context of water, freezing occurs when liquid water loses heat energy, forming ice (solid water).
The other options, b) Evaporation, c) Sublimation, and d) Condensation, involve processes that do not start with water in a liquid state. Evaporation begins with liquid water turning into vapor, sublimation involves the direct transition from a solid to a gas, and condensation involves the transition from a gas to a liquid. Understanding these phase transitions is fundamental to comprehending the behavior of water under different conditions and temperatures.