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Who is your teacher?
What is matter?
What is mass?
What are the three states of matter?
How can a solid change into a liquid?
How can a liquid change into a solid?
Water is frozen into an ice cube and then melts back to a liquid. The amount of water is the same as before freezing.
Water is poured into two containers. One container is left open, and the other is closed. After a week, the same amount of water is in each container.