Across
- 3. A league is equivalent to how many nautical miles at sea (5)
- 5. What gives red blood cells their colour (10)
- 9. Term describing the amount of light a planetary body reflects (6)
- 10. The hardware device modulator-demodulator is a commonly know as (5)
- 13. Element with atomic weight of 1.00794 on periodic table (8)
- 16. (Igneous rock with less density than water (6)
- 17. Pigment that gives your skin and hair colour (7)
Down
- 1. The scientific unit named after Sir Isaac Newton measures what (5)
- 2. A hydrogen atom has how many electrons (3)
- 4. Inferior and fata morgana are types of what optical illusion (6)
- 6. First successful vaccine developed by Edward Jenner in 1796 (8)
- 7. Which inorganic material is produced by lightning (5)
- 8. Stratus and cumulus are types of these (6)
- 11. Heave metal element once known as quicksilver (7)
- 12. Primary unit of temperature measurement in the physical sciences (3-6)
- 14. Malleus, incus and stapes are found in this part of the body (3)
- 15. Element with the shortest name on the periodic table (3)
- 18. Invented the first alternating current induction motor (6-5)