Science Crossword Puzzle for Adults: Free Printable

The worksheet

1. The fundamental structural and functional unit of all living organisms
3. The molecule that carries genetic instructions in all living things
6. A threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes
12. A submicroscopic infectious agent that replicates only inside the living cells of an organism
13. Molten rock that breaks through the Earth's surface
15. The process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water
18. A unit of heredity that is transferred from a parent to offspring
20. A nucleic acid present in all living cells that acts as a messenger carrying instructions from DNA
21. A triatomic molecule consisting of three oxygen atoms
22. A substance that can accept hydrogen ions or more generally, donate electron pairs
23. A pure substance consisting only of atoms that all have the same number of protons

2. A device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation
4. A chemical substance that neutralizes alkalis and turns litmus paper red
5. A natural phenomenon by which all things with mass or energy are brought toward one another
7. An alteration in the nucleic acid sequence of the genome of an organism
8. An astronomical event that occurs when an astronomical object or spacecraft is temporarily obscured
9. A combustible black rock consisting mainly of carbonized plant matter
10. A result obtained by dividing one quantity by another
11. A solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or moon
14. An optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses
16. A band of colors, as seen in a rainbow, produced by separation of the components of light
17. The liquid in which a solute is dissolved to form a solution
19. A system for detecting the presence, direction, or speed of aircraft and other objects using radio waves

Answer key

The PDF has the worksheet on page one and the filled grid on the last page, so you can print the puzzle and keep the key for checking.

Print pack

Two or four versions of this puzzle with different layouts, a separate answer key for each, your own header line, and no Grid Genius footer.

Your first worksheet, answer key, and play link stay free. The pack is the extra.