1. The document provides details of a 9th standard Social Science lesson about salinity of ocean water and the factors that affect it. 2. Key points covered in the lesson include the definition of salinity as the amount of dissolved salts in sea water, the average salinity of 35 parts per 100 grams, and factors like evaporation, rainfall, and melting ice that cause salinity levels to vary. 3. The temperature of ocean water also ranges depending on latitude, salinity, wind, and depth, with the highest average temperatures near the equator and lowest in higher latitudes.

1. Preliminary Details
Name of the Teacher : Veena Johnson Std : IX.A
Name of the School : E.V.H.S.S Elamannoor Period: 4
Subject : Social Science Date : 5/10/15
Unit : 4, The Ocean and man Strength:
16
15
Lesson : Salinity of Ocean water and Temperature Duration : 40 min
Learning Outcomes
 After learning this lesson student will be able to:
 Define Salinity
 Understand the average salinity of sea water
 Find out the factors affecting salinity
 Find out the factors affecting the temperature of ocean water
 Analyse the latitude and average temperature of ocean water

2. Content Overview
 Amount of study in Ocean water
 Factors affecting salinity
 Factors affecting the temperature
 Latitude and average temperature
Content analysis
Terms : Salinity Magnesium chloride, magnesium sulphate, calcium sulphate
Facts :
 The salinity of ocean is the amount of salt present in the sea water
 Salinity is usually expressed as the number grams of dissolved salts in 100 gms of sea water
 The average salinity of the sea water is 35 parts per 100 grams
 The main reason for the salinity of ocean is the dissolved sodium chloride
 Salinity will below in regions that receive heavy rain fall
 Water reaching the ocean from melting ice causes a fall in salinity
Concept : Salinity of ocean water, factors affecting salinity

3. Pre requests
The student already know the ocean water is saline water
Teaching Learning Resources
Chart, Text Book, B.B, Chord
Introduction
Teacher enter into the class and greeting the students. Ask some questions
Teacher : how do you spend your holidays?
Student : watching TV, went to outgoing
Teacher : Where you went for outing?
Student : Beach, Park, watching movie, etc
Teacher : What are the specialities of beach?
Student : The sea waves come and gone that is very nice to seeing.
Teacher : What is the taste of sea water? Is it drinkable
Student : The taste is saline. It is not drinkable water.

4. Development of the Lesson
Content Classroom interaction Procedure Pupils Response
Salinity of Ocean water
Other than sodium chloride in sea
water
Salinity of Ocean water
Salinity of ocean is the amount of salt present in the
sea water. Salinity is usually dissolved salt in 1000
grams of sea water. The average salinity of sea water
is 35 per 1000 grams. This expressed as 35 %. The
main reason for salinity of ocean dissolved sodium
chloride.
There are salts other than sodium chloride in the sea
water are
B.B.W
 Magnesium Chloride
 Magnesium Sulphate
 Calcium Sulphate
 Potassium Sulphate
 Calcium Carbonate
 Magnesium Bromide

5. Factors affecting Salinity
Temperature of ocean water
The factors affecting salinity
Chart-1
 Evaporation increases salinity increases
 Salinity will low in regions that receive heavy
rainfall
 Salinity will be comparatively low at estu
arises.
 Water reaching the oceans from melting ice
causes fall in salinity
 In areas where cold and warm currents meet
salinity in comparatively low
The temperature of the ocean water range between 2o
c
to33o
c. Temperature is different in many places.
Factors affecting temperature of ocean water
 Latitude
 Salinity
 Wind
 Ocean depth

6. Group Activity
Teacher divided students into 3 groups and giving
activity cards.
Latitude Average Temperature
0o
– 10o
26.72o
c
10o
– 20o
25.60o
c
20o
– 30o
23.16o
c
30o
– 40o
17.98o
c
40o
– 50o
10.33o
c
50o
– 60o
4056o
c
Analyse the table and answer the questions
1. What changes occur in the temperature of sea
water according to latitudinal differences?
2. In which latitudinal zone is the highest average
ocean temperature recorded?
3. In which latitudinal zone is the lowest average
ocean temperature recorded?
Students Present the
answers

7. Review Questions
 Define Salinity?
 What is average salinity of sea water?
 What is the main reason for Salinity Ocean?
 What are the factors affecting salinity?
 What are the factors affecting the temperature of ocean water?
Post lesson Activity
 Write a short note about salinity of ocean water
 Write the factors affecting salinity