About this puzzle
These are the words that show up again and again in elementary and middle school science: the steps of the scientific method, like Observation, Hypothesis, and Experiment, plus big ideas from physics, chemistry, biology, and earth science. You will find Atom and Electron next to Fossil and Habitat, and Gravity alongside Friction and Velocity.
Each word has a short, accurate definition below the puzzle, which makes the page useful as a vocabulary review before a test or as a sub plan that still teaches something. It also works at home for a science-curious kid, or for an adult who wants to brush up on terms half-remembered from school.
The 28 words in this puzzle
Every word, with a short note. Handy for teaching the vocabulary before or after solving.
In every version (12)
- Atom
- The smallest unit of an element that still has that element's properties. Atoms are built from protons, neutrons, and electrons.
- Cell
- The basic unit of life. Some living things, like bacteria, are a single cell, while the human body is made of trillions of them.
- Energy
- The ability to do work or cause change. Energy is never created or destroyed; it only changes form, such as from chemical to heat or motion.
- Experiment
- A planned test of a hypothesis. In a fair experiment, scientists change one variable at a time and keep everything else the same.
- Fossil
- The preserved remains or traces of an ancient living thing, such as bones, shells, or footprints. Most fossils are found in sedimentary rock.
- Gravity
- The force that pulls objects with mass toward each other. Gravity keeps your feet on the ground and holds the Moon in orbit around Earth.
- Habitat
- The natural home of a plant or animal, where it finds the food, water, shelter, and space it needs to survive.
- Magnet
- An object that attracts iron and some other metals. Every magnet has a north and a south pole, and opposite poles attract each other.
- Microscope
- An instrument that magnifies tiny objects. Robert Hooke used one to look at cork in 1665 and coined the word cell for what he saw.
- Planet
- A large, round body that orbits a star and has cleared its path of other objects. Our solar system has eight planets, from Mercury out to Neptune.
- Telescope
- An instrument that gathers light to make distant objects look closer. Galileo used one around 1610 to discover the four largest moons of Jupiter.
- Volcano
- An opening in Earth's crust where melted rock, called magma, rises to the surface. Once it erupts out of the ground, the molten rock is called lava.
Added in Medium and Hard (8)
- Ecosystem
- A community of living things together with the nonliving parts of their environment, like water, soil, and sunlight, all interacting.
- Element
- A pure substance made of only one kind of atom, such as gold, oxygen, or carbon. The periodic table arranges elements by atomic number.
- Force
- A push or a pull. Forces can start an object moving, stop it, or change its direction, and scientists measure them in units called newtons.
- Friction
- A force that resists motion when two surfaces rub together. Friction makes heat, which is why rubbing your hands together warms them.
- Hypothesis
- A testable prediction or possible explanation that a scientist checks with an experiment. A good hypothesis can be shown to be wrong.
- Matter
- Anything that has mass and takes up space. On Earth, matter is usually found in one of three states: solid, liquid, or gas.
- Molecule
- Two or more atoms bonded together. A water molecule, for example, is made of two hydrogen atoms joined to one oxygen atom.
- Orbit
- The curved path one object takes around another because of gravity. Earth takes about 365 days to complete one orbit around the Sun.
Added in Hard (8)
- Circuit
- A complete loop that lets electricity flow. If a switch is opened or a wire breaks, the loop is broken and the bulb or motor stops working.
- Density
- How much mass is packed into a given volume. Ice is less dense than liquid water, which is why ice cubes float.
- Electron
- A tiny particle with a negative charge that moves around an atom's nucleus. It is roughly 1,800 times lighter than a proton.
- Erosion
- The wearing away and moving of rock and soil by water, wind, or ice. Over millions of years, the Colorado River carved the Grand Canyon through erosion.
- Evaporation
- The change of a liquid into a gas, like a puddle drying in the sun. It is a key step in the water cycle.
- Nucleus
- A central core. In an atom, the nucleus holds the protons and neutrons, and in many living cells it holds the DNA that acts as the cell's instructions.
- Observation
- Gathering information with the senses or with tools like thermometers and rulers. Careful observation is where most scientific questions begin.
- Velocity
- Speed in a particular direction. Two cars going 50 miles per hour have the same speed but different velocities if they head opposite ways.
A few facts to share while you solve
- Sunlight takes about 8 minutes and 20 seconds to travel from the Sun to Earth.
- Water expands by about 9 percent when it freezes, which is why a full bottle of water can crack in the freezer.
- A bolt of lightning can heat the air around it to temperatures several times hotter than the surface of the Sun.
Four versions of this puzzle
Pick a version with the buttons above the grid. Each one has its own grid and answer key, and your progress on each is saved separately in this browser.
| Version | Words | Grid | Directions |
|---|---|---|---|
| Easy | 12 | 12 × 12 | The 12 most familiar words, reading forward across and down. |
| Medium | 20 | 15 × 15 | Twenty words across, down and diagonally. No backwards words. |
| Hard | 28 | 16 × 16 | Every word, in all eight directions including backwards, with look-alike filler letters. |
| Large print | 12 | 11 × 11 | The 12 most familiar words on a small grid with big letters. No backwards words. |
Hard and large print versions
Hard science word search: all 28 words on a 16 × 16 grid, hidden forward, backward, up, down and along both diagonals, with filler letters borrowed from the word list. Print it without the word list for an extra challenge. Play the hard version, or see all hard word searches.
Large print science word search: the 12 most familiar words on a 11 × 11 grid, printed with big letters and a big word list, and no backwards words. Play the large print version, or see all large print word searches.
Printing this word search
Press Print / PDF above the puzzle. You get a clean one-page sheet with the title, the grid, a word list with tick boxes, and optional name and date lines. The answer key prints on a second page. Prefer a file? Download it as a PDF or an image to print later or drop into a worksheet. Whatever version is showing on screen is the one that prints, and the large print version prints with bigger letters.
How to play online
- Find a word from the list in the grid. Scanning for its first letter is the quickest way.
- Drag across the word from its first letter to its last. On a phone, you can also tap the first letter, then the last.
- Found words get highlighted and crossed off. Stuck? Hint circles the first letter of a word you haven’t found.
Read the full guide to solving word searches, with tips that make big grids much faster.
Questions and answers
What grade level is this science word search for?
The vocabulary lines up best with grades 3 through 8. Younger students will know Magnet, Fossil, and Cell, while words like Velocity, Density, and Hypothesis fit upper elementary and middle school. Use the easy level for younger classes and the hard level for older ones.
Which areas of science does the word list cover?
It samples several branches on purpose: the scientific method (Observation, Hypothesis, Experiment), physics (Gravity, Force, Friction, Velocity), chemistry (Atom, Molecule, Element), life science (Cell, Habitat, Ecosystem), and earth and space science (Fossil, Volcano, Erosion, Planet).
How can I turn this puzzle into a vocabulary activity?
Once students find every word, ask them to write each one next to its science branch, or cover the notes and have them write their own definitions. Comparing their versions with the notes on this page makes a quick self-check before a quiz.
Is there an answer key for this science word search?
Yes. Choose Print / PDF above the puzzle and keep “Add an answer key page” ticked. The key prints on its own page, with every word highlighted. While playing online, Show answers outlines any words you haven’t found yet.
Can I print copies for my class or group?
Yes. Every puzzle on BetterWordSearch is free to print for personal, classroom, library and homeschool use. Print as many copies as you need. To change the words or make several different versions of the grid, use the word search maker.
What changes between Easy, Medium, Hard and Large print?
Easy hides the 12 most familiar words, reading left to right and top to bottom. Medium uses 20 words and adds diagonals. Hard hides all 28 words in every direction, including backwards, with look-alike filler letters. Large print uses the same words as Easy on a small grid and prints with big letters.
