This document contains a detailed lesson plan for a Grade 10 Science class on magnetic reversals and seafloor spreading. The plan outlines the objectives, topics, materials, procedures, and evaluation for a 60 minute lesson. Students will analyze a magnetic polarity map, calculate seafloor spreading rates, and present their findings. They will learn that magnetic reversals are caused by changes in Earth's core and prove seafloor spreading by magnetic patterns in ocean floor rocks. The lesson aims to help students understand how new seafloor is created at mid-ocean ridges and how this relates to plate tectonics.

1. Republic of the Philippines
BULACAN AGRICULTURAL STATE COLLEGE
INSTITUTE OF EDUCATION, ARTS & SCIENCES
Pinaod, San Ildefonso, Bulacan
Detailed Lesson Plan
In Grade 10 Science
Time Frame: 60 minutes
Prepared by: Jayson Mananquil Labsan
BSED III- Physical Science
I. OBJECTIVES
At the end of the lesson, students expected to:
 Analyze a magnetic polarity map;
 Use legends and scales of the map properly; and
 Calculate the rate of seafloor spreading using magnetic clues.
II. Subject Matter
A. Topic: The Earth’s Mechanism
B. Sub- Topics: Magnetic Reversal
C. References
C.1: Internet
C.2: Book: Science – Grade 10 Learner’s Material First Edition 2015,
Module 2, Page 64-69
Science – Grade 10 Teacher’s Guide First Edition 2015,
Module 2, Page 41-42
D. Materials
D.1. For the Teacher: Visual aids, Laptop, Projector, magnetic polarity map and
metric ruler
D.2. For the Student: Bond Paper, Pentel pen and manila paper
E. Teaching Strategies: Constructivist Approach & Collaborative Learning
III. Procedure
A. Daily Routine
Teacher Student

2. Prayer
Class, please stand up and let us pray.
Greetings
Good morning class!
Classroom Conditioning
Kindly arrange your chairs and pick up
those pieces of paper around you.
Okay, please be seated.
Checking of Attendance
Danica, is there any absent for today?
Very good!
Checking of Assignment
Did I give you any assignment yesterday?
Exchange your paper to your seatmate.
( the students will pray)
Good morning Sir!
Thank you Sir.
None
Yes
B. Recall
Teacher Student
Last meeting i group you into three, can
you proceed to your proper group?
I have here a puzzle and i need you to cope
up the puzzle by group.
First group who pasted on the board given
the what types of boundaries and their
meaning will get 3 points in the quiz.
Did you get it the instruction?
Anyone of representative by group and
pick-up your puzzle on my table.
Ready? Start! Now!
Very nice game. I think all are ready to
move on to the next topic.
Please settle down.
Yes Sir.
Yes Sir.
( Participate all members of group in the
game)
Yes Sir.
C. Motivation
Teacher Student
before I proceed to the next topic, let’s
have a Fun Learning.
Yes, Sir.

3. Right side are group 1 and left side are
group 2, this game antitled “Subduction
Hunter.”
Instruction.
1. Choose your leader.
2. Three terms to choose by the leaders
to commands their groupmates
which are tsunami, mountain and
volcano.
Rabbit- tsunami
Archer- Volcano
Shield- mountain
3. 1 point for every hunt.
4. If your groupmates different for
what you do, the point will added to
other group.
5. Five try only. Your score will added
to your quiz.
6. Teacher will demo the game.
Let’s start to the game . Everyone please
stan up.
( Everybody particate in this game)
D. Procedure
Teacher Student
Yesterday, you understand the Seafloor
Spreading Theory.
Later on, you will try the activity to find
how fast the seafloor is spreading.
Seafloor spreading was strengthened with
the discovery that the magnetic rocks near
the ridge follow a pattern aside from the
fact that rocks near the ridge are
remarkably younger than those father from
the ridge.
A magnetic compass tells us directions on
Earth. It also proves that the Earth has a
magnetic field. The needle of a magnetic
compass usually points to the North Pole of
the Earth which is actually the South
Magnetic Pole at present.
The Earth’s magnetic field is generated in
the very hot molten outer core and has

4. already existed since the birth of our planet.
The Earth’s magnetic field is a dipole, one
that has a North Pole and a South Pole.
E. Pre- Activity
Teacher Student
Last meeting I grouped you into three for
your activity today, can you please proceed
to your groupmates?
Where going to works the Activity 5 an
titled “How fast does it go!”
In this activity, students will compute for
the rate of seafloor spreading.
Everyone, please read the objectives
Instruction:
1. Get one manila paper and pentelpen
for your activity.
2. Cooperate and collaborate with your
groupmates.
3. Your time is 10 minutes to study, to
analyze and to answer the guide
questions.
4. Choose two to three presenter of
your activity.
5. Your score for this activity is based
on rubrix.
Let’s start !
The objectives of this activity are:
 Analyze a magnetic polarity map.
 Use legends and scales of the map
properly.
 Calculate the rate of seafloor
spreading using magnetic clues.
F. Post Activity
Teacher Student
Time is up!
Please, paste your activity works on the
board.

5. Give yourself “Nice Clap”
Let’s start group 1.
I want to hear the next group, group 2.
Present your work group 3.
(The teacher will add information while the
presenters presents their works.)
You will now be able to determine the
distance a continent moves for every year.
Remember that NOT ALL plates move at
the same rate.
Magnetic reversal is also called magnetic
‘flip’ of the Earth. It happens when the
North Pole is transformed into a South Pole
and the South Pole becomes the North Pole.
This is due to the change in the direction of
flow in the outer core.
Magnetic reversals happened many times in
the past. The occurrence of magnetic
reversals can be explained through the
magnetic patterns in magnetic rocks,
especially those found in the ocean floor.
When lava solidifies, iron bearing minerals
crystallize. As these crystallize, the
minerals behave like tiny compasses and
align with the Earth’s magnetic field. So
when magnetic reversal occurs, there is also
a change in the polarity of the rocks.
(The presenter presents their works and
asnwer the quide questions )
G. Generalization
Teacher Student
What is magnetic reversal? How does
magnetic reversal happen and how does it
prove seafloor spreading?
Magnetic reversal is also called magnetic
‘flip’ of the Earth. It happens when the
North Pole is transformed into a South Pole
and the South Pole becomes the North
Pole. This is due to the change in the
direction of flow in the outer core.

6. H. Valuing/ Application
Teacher Student
After the activity, how you relate the
creation of a new seafloor with the one that
causes it?
Or in your daily life.
(students will answer in authentic way)
IV. Evaluation
Create a song by group about the topic for today and the time is maximum 3-4
minutes to present. Your score is based on the rubrics.
V. Assignment
Bring the following materials tomorrow:
 Dropper
 food color
 700 mL water
 3-5 small / light wood blocks
 hotplate/alcohol burner & tripod