NGSS
1-PS4-3
2 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Grade 1 Science · Chapter 1 · Lesson 2
See Through, Cloudy, or Blocked
What happens when something is in the way.
Grade 1 Science · Chapter 1 · Lesson 3
A shadow is where the light could not get to.