RockLicker · Grade 5 · Lesson 3 of 5

How a Rock Forms Matters

Classify supplied rock histories by formation process and explain why appearance alone is insufficient.

  • Grade 5
  • 45 minutes
  • Worksheet + teacher guidance
Back to Grade 5

What you will learn

Rock types describe formation: cooling of molten material, accumulation and formation of sedimentary material, or alteration while solid. Similar colors can occur in different rock types.

Words to use

  • solidify: become solid
  • cementation: minerals bind sediment
  • metamorphism: change while solid

Evidence for this lesson

A: molten material cooled and solidified. B: grains accumulated in layers, then became bound by mineral cement. C: an existing rock changed under heat and pressure without melting. D: a gray rock feels heavy; its origin is unknown.

Use the supplied record as written; do not invent missing results.

Work through the activity

  1. 5 min · Recall originsRead the three process definitions. Make a heading for igneous, sedimentary and metamorphic rock.
  2. 15 min · Sort historiesRead cards A–C. Underline the formation evidence and place each beneath the appropriate heading.
  3. 15 min · Compare processesExplain why the word “heat” alone cannot classify a rock. Distinguish melting and cooling from alteration without melting.
  4. 10 min · Assess an unknownRead card D. State why color and weight alone do not provide a complete formation history; propose a useful next observation.
RockLicker
GRADE 5 · LESSON 3

How a Rock Forms Matters

Draw on the printed sheet or write, type or dictate your response.
Draw on the printed sheet or write, type or dictate your response.
Draw on the printed sheet or write, type or dictate your response.
Draw on the printed sheet or write, type or dictate your response.

Responses stay in this open page only. Print before closing or changing pages; no student record is stored online.

Check your understanding

A rock changes under heat and pressure without melting. Which category fits?

Teacher & family guide · answers and assessment

Grade 5 · How a Rock Forms Matters

Learning goal: Classify supplied rock histories by formation process and explain why appearance alone is insufficient.

Expected responses

  1. A igneous: molten material cools; B sedimentary: deposited grains are cemented; C metamorphic: alteration occurs without melting.
  2. A formed after cooling from melt; C changed while solid.
  3. No. The supplied color and subjective weight description are insufficient.
  4. Texture, grain relationships, structures and geological context could help.

Understanding check: Metamorphic. Remaining solid during alteration distinguishes metamorphism from cooling a melt.

Watch for this misconception

Bands do not automatically mean sedimentary rock; many metamorphic rocks are banded.

Assess the evidence

Look for the observations, calculation or explanation named in the learning goal. Accept accurate drawings and dictated responses. Use the expected responses to discuss reasoning; a correct guess without explanation is a starting point for another conversation.

Adapt and extend

Read prompts aloud, enlarge print or let a partner record the learner’s explanation. Draw a rock-cycle path that connects two of the history cards.