RockLicker · Grade 2 · Lesson 2 of 5

Soil Is a Mixture

Describe different ingredients in soil and distinguish observations from assumptions.

  • Grade 2
  • 35 minutes
  • Worksheet + teacher guidance
Back to Grade 2

What you will learn

Soil can include mineral particles, organic material, water and air. A small sample is not the whole soil layer or an example of every kind of soil.

Words to use

  • soil: material that can support plant growth
  • organic: from living things
  • particle: a small piece

Evidence for this lesson

Comparison example: a clean dry sand tray contains many tan mineral grains and no visible leaves or roots. A soil tray includes mineral grains and visible leaf pieces.

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

Work through the activity

  1. 5 min · Start safelyAn adult selects the image or tray. Look without tasting, smelling closely or making dust. List the different things you can see.
  2. 10 min · Group ingredientsDraw a tiny pebble, fine mineral grains and any visible plant pieces. Label only what you can observe; unseen air or water should be noted as an idea to discuss.
  3. 10 min · Compare an exampleCompare your sample with the supplied dry sand description. Ask whether both samples have the same visible ingredients.
  4. 10 min · Explain limitsWrite “I observed …” and “I cannot tell …”. Discuss why one tray cannot describe all the soil in a garden.
RockLicker
GRADE 2 · LESSON 2

Soil Is a Mixture

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

Which is an example of visible organic material?

Teacher & family guide · answers and assessment

Grade 2 · Soil Is a Mixture

Learning goal: Describe different ingredients in soil and distinguish observations from assumptions.

Expected responses

  1. Answers vary; do not require an ingredient that is absent.
  2. A leaf or root fragment is appropriate if present; “none visible” is valid.
  3. Sand may show mainly mineral grains while the soil may include plant material.
  4. Accept limits about depth, unseen organisms, moisture or other parts of the garden.

Understanding check: A leaf fragment. A leaf fragment came from a living plant. Quartz is a mineral.

Watch for this misconception

Soil is not simply crushed rock, and dark color does not prove a soil is rich or safe.

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. Compare two photographs of soil and list similarities without ranking which is better.