Across
- 4. ______ measures how large an object is.
- 5. An ______ has a negative charge.
- 6. ______ open to allow gases to enter leaves.
- 8. A ______ has a positive charge.
- 9. _______ takes energy from the sun.
Down
- 1. ________ provides energy to living cells.
- 2. An electron orbits the atomic ______.
- 3. A ______ carries no electrical charge
- 4. Plants store excess sugar as ______.
- 7. An ______ is the basic building block of matter.