Answer:
1. If you heat ice, it will turn into water.
2. If it rains , I wil stay home
3. If you don't water plants regularly, they will die.
4. If you leave margarine under the sun , it will melt soon
5. If you water a cactus every day , it will die in a short time
Step-by-step explanation:
Zero Conditional is used with both clauses in the Present Simple to indicate situations that are facts or always true. Meanwhile, the First Conditional consists of a condition clause in the Present Simple and a result clause with Future Simple will. It is used to express possible or probable situations in the future.