For more information about the understandings, essential
questions, and alignment of this lesson to National Health Education Standards,
State Standards, please visit our website, www.roadoflife.org
In order to survive humans need water, food and
shelter.These three basic elements provide
a foundation for humans to sustain life.Since the earth is composed of 70% water, it has been argued that water
is the most important of these elements.Without clean water to drink, a person cannot live longer than a couple
of days.In comparison, a person can
live for weeks without food and shelter.One major component of a functioning society in ancient times involved
clean drinking water, and today some third world countries still are not
afforded this necessity.
Invite students to brainstorm ideas about the composition of
the earth and the human body.After
students have discussed the different components of the earth and the human
body, explain to the students that the body and the earth are mostly made of
Body:More than half of the human body
consists of water.
Earth:70% of the earth is made of water.
Note to Teacher:Students may find it difficult to understand
that the human body is made mostly of water when humans have an epithelial
(skin) outer covering.In order to
illustrate this point you may choose to do the Fruit Demonstration Activity.
Ask students to identify the purpose of water.What do humans use water for and how does
water benefit the human race?Humans
need water to drink, and to clean their bodies as well as other objects.Water also serves as a tool to prevent dental
cavities through fluoridation.
Learning Activity: Research
Divide the class into groups of five students.Each group is responsible for researching
water as it relates to different cultures around the world and giving a brief
presentation about their results.The
students are allowed to use the library and the internet to gain useful
Within the group, have each student volunteer to complete a
portion of the research project and presentation.The
five duties include examining the culture, identifying the problem, discovering
the impact of the water-health issue, recognizing the solution, and the references
used for research.
1.Culture:background and history including population,
location or region of the world, and land composition
2.Problem:water related health issue that affects the
3.Impact:How does this health issue affect humans?
4.Solution:explain how technology from different area
(transportation, communication, nutrition, healthcare, agriculture,
entertainment, and manufacturing) could solve the problem
5.References:books, articles, and websites used in
research and other suggestions to learn more about the topic
If students are
having trouble identifying topicsto
research some, some examples include the lack of fluoridation in third world
countries, clean drinking water, sewer systems, and polluted lakes, rivers, and
•This demonstration further
explains the somewhat abstract concept that the human body is composed mainly
of water, despite the fact that it is not seen due to our skin.
Directions and Debrief:
open the fruit)Inform students
that this grapefruit is like our bodies. On the outside, it is firm, solid,
and can sit up on its own, but on the inside it is filled with water.
Slice the fruit and give a piece to each
student, allowing them to feel the outside and the inside of the
fruit.Discuss the structure of the
fruit and how the peel or the outer covering of the fruit aids in
protecting the more vulnerable parts inside of the fruit.Discuss how this concept relates to the
human body and how the skin helps to protect the inner parts of the
by explaining to the students that the water that gives us shape and form
is inside our body. If possible, dissect the grapefruit and extract the
tiny bits of the grapefruit that actually hold the water and juices.These tiny pieces of the grapefruit
illustrate how the water in the human body is encapsulated in the organs. In fact, that is the reason why we as
humans are not like huge puddles or all wet and soggy.