NGSS
HS-LS2-3
4 lessons teach this standard. Every lesson is interactive, and every one prints as a worksheet with a separate answer key.
Environmental Science · Chapter 2 · Lesson 1
Producers and Primary Productivity
A tree is built mostly out of air.
Environmental Science · Chapter 2 · Lesson 3
The fast cycle and the slow one are almost separate.
Environmental Science · Chapter 2 · Lesson 4
The Nitrogen and Phosphorus Cycles
Air is four-fifths nitrogen and plants can starve of it.
Environmental Science · Chapter 2 · Lesson 5
The same water, moving between reservoirs.