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BUILD · Science · Autumn 2 · Week 3

Test rock hardness and water

I am learning to test a rock in two ways.

40 minutes

Staff resources

Teacher notes (PDF) · Teacher notes (Word) · TA brief (PDF) · Slides (PowerPoint) · Word page (PDF) · Knowledge organiser (PDF)

Verbatim SoW objective: Test rocks for hardness and whether they let water through.

Arrival · 5 min

Point to a safe rock.

Offer a safe kit choice and short first–then cue.

Starter · 3 min

Think back. Say, sign or point.

  1. How can we sort two rocks?
  2. What can we do with a clean tub?
  3. Name one body part that helps protect organs.

Today I will check:

Ask three low-stakes prior questions; answers in note.

I do · 5 min

Watch two safe tests.

Words: hardness · absorb · water · test

WordIt meansExample
hardnesshow hard a thing is to markThe tool marks this rock.
absorbtake in a liquidWater soaks in.
watera liquid used in our testI add three drops.
testa check to find outI test two rocks.
Test rock hardness and water picture model On topThroughEdge route
Check the path: on top, through the rock or round its edge. The pictures are models, not test results. Simplified; not to scale.

Watch: Adult uses one blunt tool. A gets a mark. Three drops stay on top.

Show me: Is a wet top proof that water went right through?

Pre-teach words; show the full model; ask the show-me check.

We do · 7 min

Test two safe rocks.

Our turn: Mark B. Add three drops. The drops ____.

Talk, then sort.

  • Use an adult-held blunt tool
  • Add three drops
  • Look in the tray below

Ready to sort.

F · help

Watch one drop. Point to the top or tray.

M · say why

Try the safe test. Say what happened.

H · stretch

Why must each rock get the same drops?

Try it with kit

Guess first: Will drops pass through?

Kit: Two safe rocks · Adult-held blunt tool · Dropper and tray

  1. Guess first.
  2. Adult tests a mark on each rock.
  3. Add three drops to A. Check the edge and below.
  4. Do the same on B. Record the route seen.
RockMark?Water route seen
   

Risk: Tools or rough rocks may hurt skin; spills may be slippery.

Safe: Let staff use the tool. Keep drops in the tray. Do not taste; wash hands after.

Check against the school risk assessment and CLEAPSS guidance. Adult handles tool, inspects edges and controls water; no dust or tasting.

Hand over the missing step; offer F or H route. Reset once.

We do 2 · 5 min

All of us show one choice.

What must you check to say water passed through?

Choose a step.

All of us: The tray under a new rock C is wet before the water test. What should the class do first?

Say why.

Take one quiet minute to reset.

Take all pupil responses at once; use decision rule and parallel hinge.

Independent · 8 min

Show each test. Record what you saw.

Say it first. You can plan in any language.

Point, sign, speak, draw, type, write, use a scribe or a staff-captured photo.

F

Point to a mark and a wet rock.

Say: I can see ____ on the rock.

M

Show both tests. Tell what you saw.

Say: The drops ____ on sample ____.

H

Why use the same tool and drops?

Say: This is fair as I kept ____ the same.

Go deeper: Could a hard rock also let water through? Use each test result.

Run-off check: A drop slides off. How will you fix the test?

Choose one adult for supported pupils, one for group; swap across the week.

Review · 4 min

Check one result. Hear a next step.

Hear feedback (VF) and one next step (NS(+)). Edit one part (//).

Take one quiet minute to reset.

Give VF and one NS(+); invite one self-edit. Reset once.

Exit · 3 min

Tell an adult what you saw.

Read it back: I am learning to test a rock in two ways.

My feedback was… I showed…

Next I need to… try one small fix.

How I know: I can show a safe mark test. I can watch where drops go. I can tell what I saw.

Tell your teacher. They will pick our next start.

Take one quiet minute before the next lesson.

Hear feedback and next step, choose next start, then one-minute reset.