NGSS
2-PS1-4
3 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Grade 2 Science · Chapter 2 · Lesson 2
Making things hotter and colder changes them.
Grade 2 Science · Chapter 2 · Lesson 3
Some changes go back.
Grade 2 Science · Chapter 2 · Lesson 4
Some changes only go one way.