Educational worksheet on changes in states of matter, highlighting phase transitions and heat energy exchange.

Explanation:
Let's look at each question one by one and find the correct word based on the process described.

1. The question says: "the process of changing liquid into gas (water vapor)".
We know that when liquid water turns into water vapor, it is called evaporation.
So, the answer is evaporation.

2. The question says: "the process of changing solid into gas".
This happens when a solid turns directly into a gas without becoming a liquid first.
This is called sublimation.
So, the answer is sublimation.

3. The question says: "the process of changing solid into liquid".
When ice (solid) turns into water (liquid), it is called melting.
So, the answer is melting.

4. The question says: "the process of changing gas to liquid".
When water vapor (gas) turns into water (liquid), it is called condensation.
So, the answer is condensation.

5. The question says: "the process of changing gas to solid".
When gas turns directly into a solid, it is called deposition.
So, the answer is deposition.

6. The question says: "the process of changing liquid to solid".
When water (liquid) turns into ice (solid), it is called freezing.
So, the answer is freezing.

Final Answer:
1. evaporation
2. sublimation
3. melting
4. condensation
5. deposition
6. freezing