← Teacher guide

Quick check: sedimentary, metamorphic and the rock cycle

A self-test on sedimentary and metamorphic rock formation, the rock cycle and rock properties and uses (AC9S8U04, nodes 1, 3, 4 and 5, taught in class; node 4 a hinge).

Year 8 Earth and space · The rock cycle · about 18 minutes · Open the student lesson

Classroom resources

Load these into Waypoints Prepare: choose Load URL and paste the copied address, or download the file and import it. In Prepare, the worksheet's Teacher edition shows the answers; the student copy hides them.

Students will be able to

Timing

Four nodes at about 4 to 5 min each

Before class

A Quick check: a few questions on what students should know for AC9S8U04 nodes 1, 3, 4 and 5, which you teach in class. It has no board, no clip and no new teaching, and it is optional, so it never holds up course completion. Set the width with ?width=minimum, typical (default) or wider.

Use it as a self-test after your teaching, a starter, or revision. Igneous rocks (node 2) are on screen in the Igneous lesson. A hands-on rock collection is the best way to teach these nodes; the questions check the ideas afterwards. For traditional stone selection, local knowledge and community guidance are richer than anything on screen.

Running the lesson

  1. Do each node as a pair: the questions, then the "I can" line.
  2. The pathway question is a good prompt to draw the rock cycle diagram on the board and number the processes.

The hard part (on purpose)

Seeing the cycle as a loop with no fixed order. When a student says rocks go in one fixed order, ask whether a metamorphic rock can melt.

When students get stuck

What you will seeA question to askThe fix
A student says metamorphic rocks are melted rock.If it melted, what would it be called?Magma. Metamorphic rocks change while solid, under heat and pressure.
A student says the rock cycle always goes igneous, sedimentary, metamorphic.Can an igneous rock be squashed and heated directly?Yes. Any rock type can become any other, so there are many pathways.

Answers to the checks

  1. The sequence: Which is the correct order for forming a sedimentary rock?
    Weathering, erosion and transport, deposition, lithification
    Rock is broken down (weathering), carried away (erosion and transport), settles in layers (deposition), then is squashed and cemented into rock (lithification).
  2. Layers and fossils: Why are fossils found in sedimentary rock but hardly ever in igneous rock?
    Sediment gently buries dead organisms and preserves them, while molten rock would destroy them
    Dead organisms can be buried in mud or sand and turn into fossils as the sediment becomes rock. Molten rock would burn them.
  3. Properties and formation: Which sedimentary property comes from which step?
    Visible layers (strata) → Deposition; Grains stuck together by cement → Lithification; Sorted grains of similar size → Deposition; Hardened, compacted rock → Lithification
  4. How they form: How does a metamorphic rock form?
    Existing rock is changed by heat and pressure without melting
    If the rock melted it would become magma and form an igneous rock. Metamorphic rocks change while solid.
  5. Banding: Many metamorphic rocks, such as gneiss, show bands. Why?
    Pressure in one direction squashes and lines up the minerals
    Squeezing from one direction flattens and aligns the minerals into bands (foliation).
  6. Parent and product: What does it become with heat and pressure?
    Limestone → Marble; Shale (mudstone) → Slate; Sandstone → Quartzite
  7. A pathway: How could a sedimentary rock become an igneous rock?
    It is buried deep, melts into magma, then cools and crystallises
    Any rock can melt and re-form. The cycle has no fixed start or end.
  8. How long?: Which process usually takes the longest?
    Sandstone turning into quartzite deep underground
    Surface processes are usually quick (hours to years). Burial, heating and pressure deep down take thousands to millions of years.
  9. What drives it: How does plate tectonics keep the rock cycle going?
    It buries rocks to where they melt or change, and lifts others up to be weathered
    Subduction carries rock down to heat and pressure; collisions lift rock into mountains where it weathers. Without movement the cycle would stall.
  10. A second pathway: How could an igneous rock become a sedimentary rock?
    It is weathered and eroded into sediment, which is deposited in layers and lithified
    At the surface, weathering breaks any rock into sediment. That is a second pathway round the cycle.
  11. A benchtop: Granite is used for kitchen benchtops. Why is it suitable?
    Its minerals, mainly quartz and feldspar, are hard, and slow cooling locked them into large interlocking crystals
    Granite's hard minerals resist scratching, and the tightly locked crystals make it strong and durable. Both come from how it formed: slow cooling of magma deep underground.
  12. Marble outdoors: Marble is used for statues but wears away faster outdoors in acid rain. Why?
    Marble is made of calcium carbonate, which reacts with acid
    Marble forms from limestone, which is calcium carbonate. Acid slowly dissolves it, so details blur over time.
  13. Choosing stone: For thousands of years Wurundjeri people quarried greenstone at Wil-im-ee Moor-ring (Mount William, Victoria) to make axe heads, which were traded across south-eastern Australia. Why choose that stone?
    It is hard and tough, with fine, tightly locked grains, so a ground edge stays sharp and doesn't shatter
    Choosing this stone and trading it widely shows detailed knowledge of rock properties. Its fine, interlocking grains come from how it formed, and they are what make it tough.

Stretch and support

Stretch: Choose a building stone near school. What is its type, how did it form, and why is it a good choice?

Support: Give a blank rock cycle diagram with the processes on cards to place.

Coach prompt (optional)

For a student who has done the lesson and is still stuck. They paste it into an AI tool your school allows; it asks questions about this lesson's one idea and doesn't give answers. Students see it on the course recap page only through a link ending in ?coach=1: recap with coach prompts.

You are a patient science coach for a Year 8 student in Australia. Help me understand the ideas in ONE lesson only, from the lesson "Quick check: sedimentary, metamorphic and the rock cycle".

The ideas:
- Sedimentary rocks — weathering, transport, deposition and lithification: I can describe the formation of sedimentary rocks through the sequence of weathering, erosion, transportation, deposition and lithification, and connect observable properties to formation.
- Metamorphic rocks — heat and pressure without melting: I can explain metamorphic rock formation through heat and pressure applied to existing rock, and describe observable properties that reflect these conditions.
- The rock cycle — processes connecting all three types over geological time: I can describe the rock cycle as a set of interconnected processes by which rocks are continuously transformed between types, and identify the geological timescales involved.
- Rock properties, formation history and use: I can explain how the properties of each rock type reflect its formation history and evaluate the suitability of specific rocks for named uses.

What understanding looks like:
- Describes the formation sequence: weathering → erosion → transport → deposition → lithification
- Connects at least two observable properties of sedimentary rock to formation steps
- Identifies fossils as occurring in sedimentary rocks and explains why
- Explains that metamorphic rocks form when existing rocks are subjected to heat and pressure without melting
- Connects banding or foliation to the directional compression of metamorphism
- Identifies at least one parent rock and its metamorphic product
- Traces at least two complete rock cycle pathways, naming the process at each step
- Compares the timescales of surface and deep rock cycle processes
- Explains how plate tectonics drives the rock cycle
- Explains the properties of at least two rock types in terms of their formation processes
- Connects named rock properties to suitability for a specific use
- Identifies how traditional rock selection practices reflect knowledge of formation-linked properties

Mistakes students often make here:
- A student says metamorphic rocks are melted rock.
- A student says the rock cycle always goes igneous, sedimentary, metamorphic.

How to coach me (rules from the Waypoints Kit coach):
- Ask me one short question at a time (2 to 4 sentences) and wait for my answer. Never give me the answer before you have heard my thinking, and don't hide the answer inside your question.
- Start in Discover: ask me to explain the idea in my own words, or to predict what happens in a simple example. I can switch any time: "teach it back" (you play a beginner and I explain), "spot the flaw" (you show me an answer with one common mistake and I find it), or "check" (I explain, and you tell me what is solid and what to revisit).
- If I am stuck or say "just tell me", ask what I think first, then give a small hint or a simpler example. Explain only after I have had a real go.
- If I seem to be missing the idea that comes before this one (Igneous rocks — magma cooling and crystallisation), check it quickly, then come back.
- Stay in this idea: don't teach later ideas or add extra content. If I ask about something else, say it is for another lesson and bring me back.
- After you help, ask me one reflective question, such as how I know my answer is right or what I would check.
- Praise my effort and method, not my ability.
- You can be wrong: if I rely on something you said, remind me to check it against my notes or the lesson. If you don't know, say so.
- Use simple words.
- Stop when I can explain the idea in my own words and get one new example right. Then tell me to go back to the lesson "Quick check: sedimentary, metamorphic and the rock cycle".

Exit ticket

Name one rock type, how it forms, and one use that depends on its properties.

For example granite: cools slowly underground, hard interlocking crystals, benchtops.

What each step is for

Where it leads

Back in class: a rock sample investigation (hardness, grain size, fizzing with acid); a rock cycle role-play or poster.