Weathering for kids: make sand from rocks in a 2nd grade lab
What it is: a 2nd grade earth science activity where students rub two soft rocks together over dark paper and watch tiny grains fall off. They connect it to weathering: water, wind and ice break rock into smaller and smaller pieces over a very long time, and that is one way sand forms.
Time: about 20 minutes. Grade: 2nd grade.
Materials: pairs of soft rocks such as sandstone or chalky limestone, one smooth river stone, a tougher rock, for comparison, black construction paper, hand lenses, safety glasses, a timer and a small jar of sand.
- Pass around the jar of sand. Ask: "Where do you think sand comes from?"
- Everyone puts on safety glasses. Students hold two soft rocks low over black paper and rub them together for one minute.
- Look at the paper with hand lenses. Compare the grains with the sand in the jar.
- Repeat with the river stone. Ask: "Which rock lost more grains? Why might that be?"
- Explain: in nature, moving water, wind and freezing ice do this rubbing and breaking, but much more slowly. A beach takes a very, very long time to make.
- Students fold their paper and pour the grains into a class jar labeled "Our sand".
Safety: students wear safety glasses, rub gently and keep the rocks low over the paper. No hammering or throwing rocks. Wash hands afterward.
Differentiation: students who need support count their rubs and compare piles by size. Students who are ready time each rock for one minute and rank them from most grains to fewest. English learners can use "The ___ rock made more sand."
Quick check: ask: "Name two things in nature that can break rocks into sand."
Save this activity to your library so it is ready when you need it.
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About this resource
- Shared by
- @UpOnlyLearning · Curriculum team
- Posted
- Oct 31, 2026
- Type
- Lesson plan
- Grade
- Grades K–2
- Subject
- Science
- Language
- English
- License
- Free for classroom, co-op and tutoring use. Please don't resell.