Rocks of the Earth

Grade 10 · Geography

Semester 1 | Period 2 | Week 9

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Subject: Geography

Semester: 1

Period: 2

Week: 9

School Name: ___________________________
Teacher’s Name: ________________________
Subject: Geography
Grade Level: Grade 10
Date: Week 9
Lesson Duration: 45 minutes
Week & Period: Week 9, Period 2
Topic: Rocks of the Earth
Sub-topic: Types of Rocks and Their Formation

 

Learning Objectives

By the end of the lesson, students should be able to:

  1. Identify the three main types of rocks: igneous, metamorphic, and sedimentary.
  2. Explain the mode of formation of each rock type.
  3. Relate rock types to their uses and occurrences in the environment.

 

Previous Knowledge

Students already know:

  • Layers of the Earth (crust, mantle, core).
  • Basic characteristics of lithosphere.

 

Instructional Materials

  • Textbook: Physical Geography (Grade 10)
  • Teaching aids: samples of igneous, metamorphic, and sedimentary rocks, videos of rock formation processes, diagrams
  • Students' notebooks and writing materials

Lesson Development – ABC Model

A – Anticipation (Warm-up / Starter)

Time: 5–10 minutes

Activity:

  • Ask students:
    • “Have you ever seen rocks that look very different in your surroundings? Why do you think they look different?”
    • “Where do you think rocks come from?”
  • Record responses on the board.

Teacher’s Role:

  • Correct misconceptions (e.g., all rocks are the same).
  • Introduce the concept of rock types.

Learner’s Role:

  • Share observations of rocks from home or field trips.
  • Respond verbally and actively participate in discussion.

 

B – Building Knowledge (Main Lesson Body)

Time: 25–30 minutes

Teacher’s Role & Learners’ Activities (Expanded):

  1. Igneous Rocks
    • Teacher explains: formed from cooled and solidified magma or lava.
    • Learners observe samples, note texture (coarse or fine-grained), color, and occurrence (volcanic regions).
    • Example: Granite (intrusive), Basalt (extrusive).
    • Assessment Check: “Which rock forms when lava cools quickly on the Earth’s surface?”
  2. Metamorphic Rocks
    • Teacher explains: rocks changed by heat and pressure.
    • Learners note characteristics (foliation, hardness), examples (Marble, Slate), and locations.
    • Example: Marble originates from limestone.
    • Assessment Check: “What factors cause the formation of metamorphic rocks?”
  3. Sedimentary Rocks
    • Teacher explains: formed from deposition, compaction, and cementation of sediments.
    • Learners observe texture (layered), examples (Sandstone, Limestone).
    • Assessment Check: “Which rock type is formed from accumulated sediments over time?”

Notes (Expanded & Detailed):

  • Igneous: Intrusive (granite, slow cooling), Extrusive (basalt, rapid cooling).
  • Metamorphic: Regional metamorphism (mountain building), Contact metamorphism (near magma).
  • Sedimentary: Clastic (sandstone), Chemical (limestone), Organic (coal).
  • Uses: Construction, sculptures, roads, industrial raw materials.

 

C – Consolidation (Conclusion & Assessment)

Time: 5–10 minutes

Summary:

  • Recap the three rock types and their formation processes.
  • Highlight differences in texture, formation, and uses.
  • Discuss the link between Earth’s internal processes and surface rocks.

Evaluation Method (Expanded):

  • Exit slip/quiz:
  1. Name the three main types of rocks.
  2. Give an example of a metamorphic rock.
  3. State one mode of formation of sedimentary rocks.
  • Teacher provides oral feedback.

Assignment (Expanded): Follow-up Activity:

  • Collect rock samples from surroundings, classify them into igneous, metamorphic, and sedimentary.
  • Research one major quarry in Liberia and the types of rocks extracted.

Differentiation / Inclusive Strategies:

  • Struggling Learners: Use labeled diagrams, group sorting activity with rock samples.
  • Advanced Learners: Explain mineral composition and geological processes causing rock formation.
  • Students with Disabilities: Tactile samples of rocks for hands-on learning.

 

Teacher’s Reflection (After Class)

  • What worked well? ______________________________________________________
  • What needs improvement? _________________________________________________
  • Students’ engagement level: □ High □ Medium □ Low
  • Next steps: Prepare students for Week 10 (Characteristics and Uses of Rocks).