Lesson Notes By Weeks and Term - Senior Secondary School 1

Browse through topics for Senior Secondary 1 1st, 2nd and 3rd Terms, All Weeks, All Subjects

  1. Home
  2. Lesson Notes By Weeks and Term v2 Classes
  3. Senior Secondary 1
  4. Rock formation

Term: 2nd Term

Week: 3

Class: Senior Secondary School 1

Age: 15 years

Duration: 40 minutes of 2 periods each

Date:       

Subject:    Agriculture

Topic:-       Rock formation

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

  1. Explain the meaning of rocks
  2. Discuss each types of rock

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, textbook, pictures

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S ACTIVITY

STEP 1

INTRODUCTION

The teacher reviews the previous lesson on the environmental factors that affect agricultural production

Students pay attention

STEP 2

EXPLANATION

She explains the meaning of rocks

Students pay attention and participates

STEP 3

DEMONSTRATION

She discusses the types of rocks and their mode of formation

Students pay attention and participate

STEP 4

NOTE TAKING

The teacher writes a summarized note on the board

The students copy the note in their books

 

NOTE

ROCKS FORMATION

Rock is a relatively hard, naturally occurring mineral material. Rock can consist of a single mineral or of several minerals that are either tightly compacted or held together by a cement-like mineral matrix. The three main types of rock are igneous, sedimentary, and metamorphic

 

  1. MODE OF FORMATION OF IGNEOUS ROCK

They are formed as a result of cooling and solidification of molten magma erupted from the earth crust. Magma occurs from high temperature and pressure underneath the earth and forces itself towards the earth surface through the cracks. As the magma approaches the earth surface, it cools as a result of lower temperature of the earth surface and solidify to form igneous rocks.

TYPES OF IGNEOUS ROCK

  1. PLUTONIC [INTRUSIVE] IGNEOUS ROCK: These are rocks formed when molten magma solidifies slowly before it gets to the surface of the earth to form large crystals. Prolonged erosion makes the rock to be exposed later to the surface. Examples include granite, gabbro, and diorite.
  2. VOLCANIC [EXTRUSIVE] IGNEOUS ROCK: These are formed when the molten magma cools and solidifies rapidly when it gets to the surface to form crystals. Examples include basalt, pumice.

CHARACTERISTICS OF IGNEOUS ROCKS

  1. They have glassy appearance
  2. They contain crystals i.e they are crystalline in nature.
  3. They do not occur in layers.
  4. They do not contain fossils.
  5. They are hard and impervious
  6. They are resistant to erosion

 

  1. MODE OF FORMATION OF SEDIMENTARY ROCKS

They are rocks formed from deposits of organic materials and existing weathering rocks which accumulate and consolidate over time. They are cemented together after a long time to form sedimentary rocks. The sediments are deposited by natural agents such as water, wind and ice and settle down in layers one on top of another.

There are three types of sedimentary rocks based on the process of formation.

  1. Mechanically formed sedimentary rocks: These are rocks formed from sediments of other rocks that are accumulated and cemented over a long period of time. Examples include sandstones, shale, clay, breccia, and conglomerate.
  2. Organically formed sedimentary rocks: These are rocks formed from the remains of living organisms. When the rocks are formed from the remains of animals like coral or shellfish, they are called calcareous rocks e.g. lime stone and chalk. When the rocks are formed from vegetable matter such as swamps and forest are called carbonaceous rocks e.g. coal, peak, and lignite.
  3. Chemically formed sedimentary rocks: These are rocks formed from precipitated chemically from rock solution. Examples include gypsum, potash, and dolomite.

CHARACTERISTICS OF SEDIMENTARY ROCKS

  1. They occur in layers or strata.
  2. They are not in crystal form i.e they are not crystalline in nature.
  3. They contain fossils of plants and animals.
  4. They are not resistant to erosion
  5. They may be coarse, fine soft or hard.

 

  1. MODE OF FORMATION OF METAMORPHIC ROCKS

These rocks result from igneous or sedimentary rocks due to combined effect of pressure and heat. The composition and texture of unstable parent rock minerals are changed under pressure and heat. Examples are marble, quartzite, gneiss, schist, graphite and slate.

  • Slate is formed from clay (sedimentary)
  • Marble is formed from limestone (sedimentary)
  • Quartzite is formed from sandstone (sedimentary)
  • Gneiss is formed from granite (igneous)
  • Schist is formed from shale (sedimentary)
  • Graphite is formed from coal (sedimentary)

CHARACTERISTIC OF METAMORPHIC ROCKS

  1. Some may occur in layer or strata
  2. The rock may be hard or soft
  3. They are not in form of crystals
  4. They exist in different colours and texture
  5. They may contain fossils

 

EVALUATION:   1. Define rocks

  1. List the three types of rock
  2. What is the mode of formation of
  3. igneous rocks
  4. sedimentary rocks
  5. metamorphic rocks
  6. Give three examples each of
  7. igneous rocks
  8. sedimentary rocks
  9. metamorphic rocks

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively