Sorting Rocks Worksheet: Free KS2 Science Printable

What this worksheet teaches

In Year 3, children begin to look at rocks as scientists do: not just naming them, but observing and comparing their properties. This worksheet focuses on simple properties children can observe for themselves: whether a rock is hard or soft, shiny or dull, rough or smooth, and whether water soaks into it. By colouring five contrasting rocks and then deciding which sentences about them are true, children practise the key scientific skill of grouping objects on the basis of shared and differing features. The colouring step is deliberate: deciding which textures to shade encourages children to look closely before they sort.

How to use it at home or in class

Print the sheet onto a single sheet of A4 and, if you can, gather a few real rocks and pebbles to handle alongside it. Children colour the five rocks first, then read each sentence and tick the ones that are true. Where possible, let them test their ideas: rubbing two rocks together shows which is harder; a drop of water shows whether a rock is porous (soaks up water) or not. There are no single right answers for every rock here, because real rocks vary; the value is in children justifying their choices. Ask them why they ticked a box, and you will quickly hear scientific reasoning developing.

Understanding the properties

Hard or soft describes how easily a rock can be scratched or worn away; chalk is soft, granite is hard. Shiny or dull refers to how light reflects off the surface, which is why crystals can sparkle while a weathered boulder looks matt. Rough or smooth is about texture, often a clue to how a rock has been shaped: pebbles in a river become smooth as they are tumbled over time. Porous or not describes whether water soaks in; porous rocks such as chalk and many sandstones have tiny gaps that absorb water, while dense rocks such as granite and slate let it run off. A common mix-up is to think shiny means hard, or that all crystals are precious; ordinary granite is full of small crystals. These four pairs give children a reliable framework for sorting almost any rock they meet.

Extending the learning

Once children are confident with this sheet, take the investigation outdoors. A rock hunt in a garden, park or along a beach gives a free supply of specimens to sort using the same properties. Encourage children to make a simple table or set of hoops on the floor and physically group the rocks: shiny in one, dull in another, then re-sort by a different property to show that the same rock can belong to more than one group. This reinforces that scientific classification depends on the question you are asking, an important idea that carries through the rest of primary science.

Frequently asked questions