Subject: Basic Science

Topic: Water Cycle

Duration: 40mins

Reference Material: Basic Science and Technology for Primary 5

Instructional Material: Chart Showing Water Cycle

Previous Knowledge: Pupils are familiar with Reproduction in Plant

Objective: At the end of the lesson, pupils should:

  • State how rain is formed
  • Draw the Water Cycle

Content:

Heat from the sun causes water to move as a gas or vapour from the surface of the earth into the sky by evaporation. The water becomes cool and forms cloud by condensation; the clouds, then send down the water back to the surface as rain.

Water cycle is the movement of water from the earth surface to sky and back to the earth as rain.

The Water Cycle

0_1587215039716_rain-formation-pry-5.png

Rain Formation

  • When rain falls, water collects in streams, rivers, lakes, ponds and seas or as puddle on the ground.
  • The heat from the sun changes some of the water to vapour or gas (evaporation). This vapour is carried up into the atmosphere.
  • The rising vapour meets cooler air in the sky and then forms cloud, this is condensation.
  • When the cloud (droplets of water) becomes too big and heavy for the air (saturated) to carry its fall back to earth as rain.

Pure water boils at 100oc, while pure water freezes i.e. turn to ice at 0oc.

Presentation:

Step 1: Teacher revises the previous lesson “Reproduction in Plants” with the pupils.

Step 2: Teacher introduces and explains the new topic to the pupils.

Step 3: Pupils are allowed to ask questions.

Step 4: Teacher writes notes under content on the board for pupils to copy.

Evaluation:

  1. What is Evaporation?
  2. Explain Rain Formation

Conclusion: Teacher moves round for inspection, marking and correction of notes where necessary.

Assignment: Basic Science Tech 5, workbook, Ex 8, 3 – 5.