A process changes the material

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4px}.mobile-label{display:block;font-size:11px;font-weight:750;color:#52636a}.cell{padding:12px}.cell-grid{gap:8px}.readiness{grid-template-columns:1fr;gap:3px}.rhythm-grid{grid-template-columns:65px repeat(4,1fr);gap:2px}.rhythm-grid>*{font-size:11px;padding:12px 2px}.ribbon{grid-template-columns:57px 1fr 48px;gap:6px}}@media print{main{max-width:none;padding:0}body{background:#fff}button,.actions{display:none}.view[hidden]{display:block!important}.paper{break-inside:avoid}}</style></head><body class=""><main><header><span class="eyebrow">Rock pathways · branching teaching model</span><h1>A process changes the material</h1><p>Worked route: Igneous rock → melting → magma → cooling and crystallization → igneous rock. The history explains why the final label can recur.</p><span class="fiction">Original illustrative example · local practice; answers are not stored</span></header><section class="paper"><span class="eyebrow">Your current material</span><h2 id="material" class="large">Igneous rock</h2><p id="available" class="muted"></p><label for="process">Choose a process</label><select id="process"><option value="">Choose a process</option><option value="Solid-state metamorphism">Solid-state metamorphism</option><option value="Weathering, transport and deposition">Weathering, transport and deposition</option><option value="Compaction and cementation">Compaction and cementation</option><option value="Melting">Melting</option><option value="Cooling and crystallization">Cooling and crystallization</option></select><div class="actions"><button id="apply">Apply process</button><button id="undo">Undo last</button><button id="reset">Reset path</button></div><div id="history" class="path" aria-live="polite">No process chosen.</div><p id="feedback" class="feedback" role="status">No process chosen. Start with igneous rock.</p></section><details open><summary>Limited-model transition key</summary><table><thead><tr><th scope="col">From</th><th scope="col">Process</th><th scope="col">To</th></tr></thead><tbody><tr><td><span class="mobile-label">From</span>Igneous rock</td><td><span class="mobile-label">Process</span>Solid-state metamorphism</td><td><span class="mobile-label">To</span>Metamorphic rock</td></tr><tr><td><span class="mobile-label">From</span>Igneous rock</td><td><span class="mobile-label">Process</span>Weathering, transport and deposition</td><td><span class="mobile-label">To</span>Sediment</td></tr><tr><td><span class="mobile-label">From</span>Sediment</td><td><span class="mobile-label">Process</span>Compaction and cementation</td><td><span class="mobile-label">To</span>Sedimentary rock</td></tr><tr><td><span class="mobile-label">From</span>Igneous rock</td><td><span class="mobile-label">Process</span>Melting</td><td><span class="mobile-label">To</span>Magma</td></tr><tr><td><span class="mobile-label">From</span>Sedimentary rock</td><td><span class="mobile-label">Process</span>Melting</td><td><span class="mobile-label">To</span>Magma</td></tr><tr><td><span class="mobile-label">From</span>Metamorphic rock</td><td><span class="mobile-label">Process</span>Melting</td><td><span class="mobile-label">To</span>Magma</td></tr><tr><td><span class="mobile-label">From</span>Magma</td><td><span class="mobile-label">Process</span>Cooling and crystallization</td><td><span class="mobile-label">To</span>Igneous rock</td></tr></tbody></table></details><aside class="note"><strong>Explain one arrow</strong><p>Why did the material change? “It is next in the circle” is not an explanation. This limited model does not identify real samples or calculate temperature, depth or geological time.</p></aside><footer>Changes and practice answers last only on this page. Keep actual observations, decisions and records in your established school, document or spreadsheet workflow.</footer></main><script>const $=id=>document.getElementById(id);const esc=s=>String(s).replace(/[&<>"']/g,c=>({'&':'&amp;','<':'&lt;','>':'&gt;','"':'&quot;',"'":'&#39;'}[c]));const status=s=>{$('feedback').textContent=s;};
const edges=[["Igneous rock","Solid-state metamorphism","Metamorphic rock","The rock changes through suitable heat and/or pressure while remaining solid."],["Igneous rock","Weathering, transport and deposition","Sediment","Broken-down material is moved and deposited. Sediment is not yet sedimentary rock."],["Sediment","Compaction and cementation","Sedimentary rock","Deposited material becomes rock."],["Igneous rock","Melting","Magma","Melting creates molten material, not metamorphic rock."],["Sedimentary rock","Melting","Magma","Melting creates molten material, not metamorphic rock."],["Metamorphic rock","Melting","Magma","Melting creates molten material, not metamorphic rock."],["Magma","Cooling and crystallization","Igneous rock","Molten material forms rock as it cools and crystallizes."]];let current='Igneous rock',history=[];function transition(from,process){const x=edges.find(x=>x[0]===from&&x[1]===process);return x?{to:x[2],explanation:x[3]}:{error:'That process is not supplied for '+from+' in this limited model. Keep the material unchanged and consult the transition key.'};}function render(){ $('material').textContent=current;$('available').textContent='Supplied here: '+edges.filter(x=>x[0]===current).map(x=>x[1]).join('; ');$('history').textContent=history.length?'Igneous rock'+history.map(x=>' — '+x.process+' → '+x.to).join(''):'No process chosen. Starting material: Igneous rock.';$('undo').disabled=history.length===0;$('process').value='';}$('apply').addEventListener('click',()=>{const p=$('process').value;if(!p){status('Choose a process. No transition made.');return;}const t=transition(current,p);if(t.error){status(t.error);return;}history.push({from:current,process:p,to:t.to});current=t.to;render();status(t.explanation);});$('undo').addEventListener('click',()=>{if(history.length){current=history.pop().from;render();status('Undone. Current material and path restored together.');}});$('reset').addEventListener('click',()=>{current='Igneous rock';history=[];render();status('No process chosen. Start with igneous rock.');});globalThis.Model={edges,transition,getState:()=>({current,history:[...history]})};render();</script></body></html>