Science // Earth's Systems

Types of rocks

Use vocabulary for Earth's geological processes and rock types — igneous, sedimentary, metamorphic, erosion, weathering, deposition, fossil, sediment, strata, permeable, impermeable — and apply these when explaining how rocks form and how landscapes change over time

Ages
9 to 11
Type
Language
Builds on
0 topics
Leads to
4 topics

Quick check

Could the learner explain the difference between a rock being weathered and being eroded — those are actually two different things?

Ask this to see whether the topic is secure.

Topic // Mastery

What mastery looks like

What a learner can do once this topic is secure.
  • Correctly classify igneous, sedimentary, and metamorphic rocks and explain in one sentence how each type forms
  • Use 'erosion', 'weathering', and 'deposition' correctly as three distinct stages in a sequence
  • Explain how fossils form using 'sediment' and 'sedimentary rock' correctly

Topic // Map

Where this fits

What to learn first and what this topic opens up, with the reason for each link. Required links come first.
  • RequiredMust come first
  • HelpfulHelps, but not essential

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Types of rocks

Ages 9 to 11 // Language

Leads to

4 topics
  • Finding patterns in dataRequired

    Earth's Systems // Ages 9 to 10

    Interpreting patterns of Earth's geological features requires rock type and erosion vocabulary

  • Erosion and weatheringRequired

    Earth's Systems // Ages 9 to 10

    Measuring weathering and erosion rates requires 'weathering', 'erosion', and 'deposition' vocabulary

  • How fossils formRequired

    Space Systems & Earth's History // Ages 9 to 10

    Identifying evidence in rock formations and fossil layers requires sediment, strata, and fossil vocabulary

  • Earth's atmosphereHelpful

    Earth's Systems // Ages 10 to 11

    Modelling geosphere, biosphere, hydrosphere interactions draws on geological vocabulary

Topic // Research-informed

Teaching notes

From the Marble Skill Taxonomy. These notes have not been validated in classrooms, so treat them as a starting point for your own judgement.

The approach

Vocabulary node for ages 9–11 on rock types (igneous, sedimentary, metamorphic) and geological processes (weathering, erosion, deposition, plus sediment, strata, permeable/impermeable, fossil). The teaching goal is not matching definitions but pinning each term to how it forms or what it does, and having children USE the words to narrate a formation in correct sequence. The two highest-priority targets: keep weathering (breakdown in place) and erosion (transport away) as distinct ordered stages, and distinguish loose sediment from compacted/cemented sedimentary rock.

Common misconceptions

  • 'Weathering and erosion mean the same thing' — conflating breaking-down-in-place with transport-away.
  • 'Igneous/sedimentary/metamorphic are just names' — not connecting each to its formation process.
  • 'Fossils are found in any rock' — not knowing they form in sedimentary rock.
  • 'Deposition is the same as erosion' — not seeing it as the later dropping-off stage.
  • 'Permeable and impermeable are about hardness' — rather than whether water passes through.
  • 'Sediment and sedimentary rock are the same' — missing that loose sediment must be compacted/cemented into rock.

Useful representations

  • A rock-type triptych (igneous / sedimentary / metamorphic) each with its formation image.
  • A weathering→erosion→deposition process strip to sequence.
  • Labelled strata diagram with 'sediment', 'strata', 'fossil' callouts.
  • A permeable vs impermeable water-drip comparison image.
  • Word–process matching cards with example landscapes.

Teaching practices

  • Pin each rock-type word to its FORMATION story (igneous=cooled magma, sedimentary=pressed layers, metamorphic=heat+pressure), not just a label.
  • Teach weathering → erosion → deposition as three DISTINCT, ordered stages, explicitly contrasting the perennially-confused weathering vs erosion.
  • Attach process words to visuals/animations of the process, then have children narrate a formation using the terms in sequence.
  • Introduce paired opposites together (permeable vs impermeable) so the contrast defines each.
  • Assess by application — the child explains how a named rock/landform formed using the terms correctly — not by matching definitions alone.

Activities to try

  1. 1

    Tour a geology scene and name what you see

    Why it works: Each rock-type word carries a formation story, and weathering/erosion/deposition are three different points along one journey, not synonyms.

    1. Study a rich labelled geological scene showing a volcano oozing lava, a banded cliff of layered rock, a swirl of folded metamorphic rock, and a river cutting through the landscape.
    2. Reveal each term in its natural home: the cooling lava is 'igneous — cooled from molten rock'; the cliff bands are 'sedimentary — layers of sediment pressed together and cemented over a long time, where fossils are typically found', with the layers labelled 'strata' and the loose material 'sediment'; the folded rock is 'metamorphic — existing rock changed by heat and pressure'.
    3. Follow the river to three separate points and name them in order: weathering (rock crumbling in place), then erosion (broken pieces carried off), then deposition (pieces dropped and settling downstream).
    4. Say aloud, for each rock type, one sentence about how it forms using the correct term.
  2. 2

    Tell the story of a rock

    Why it works: Correct vocabulary shows up in correct use: the terms must be deployed in a coherent, ordered account of formation, not merely recited as definitions.

    1. Narrate the journey of a rock high on a mountain that ends up as a pebble on a beach and, millions of years later, as a new layer of rock.
    2. Use the words weathering, erosion, deposition, sediment and sedimentary rock each in its correct place and in correct order.
    3. On request, extend to igneous and metamorphic rock and to how fossils form.
    4. Answer follow-up probes: 'When the river slows and drops its load, what is that called?' and 'Is a heap of loose sand already sedimentary rock — what has to happen first?'
  3. 3

    Sort, sequence and complete

    Why it works: Correct categorisation and sequencing are concrete checks that each term is pinned to its formation or role and that the ordered stages are kept distinct.

    1. Sort named rocks and examples into igneous, sedimentary and metamorphic.
    2. Put the three stages weathering → erosion → deposition into correct order.
    3. Match each term to its process image or short meaning.
    4. Complete the blanks in a short rock-formation paragraph using the correct terms.

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