NGSS
K-ESS3-3
3 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Kindergarten Science · Chapter 5 · Lesson 2
Some changes help. Some do not.
Kindergarten Science · Chapter 5 · Lesson 3
Three ways to make less rubbish.
Kindergarten Science · Chapter 5 · Lesson 4
Decide what to do, and say why.