Final answer:
In the water cycle, a solid changes to a liquid during melting, like when a glacier melts, and a gas changes into a liquid during condensation, which occurs when clouds form. Therefore, the correct option is b, c.
Step-by-step explanation:
To describe how water changes state in the water cycle, two correct statements are:
B. A solid changes to a liquid when a Glacier melts. This process is known as melting, and it occurs when solid ice absorbs heat and turns into liquid water.
C. A gas changes into a liquid when a cloud forms. This process is called condensation, where water vapor in the air cools down and returns to a liquid state, forming clouds.
The statement A is incorrect because during evaporation, a liquid changes to a gas, not a solid.