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The Blue Planet--Hydrosphere

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Sarah Halsted

on 16 June 2014

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Transcript of The Blue Planet--Hydrosphere

photo credit Nasa / Goddard Space Flight Center / Reto Stöckli
Welcome to the Blue Planet!
K-W-L: Water
In your DSN, draw three columns and label:


Brainstorm all you Know about water in the K column and write what you Want to know in the W column--what questions do you have about water?

Water in 3 forms!
The only substance that is found in all three forms, or phases, in nature. Let's investigate!

First-------> What is it made of??
How do we know the water molecules are there??
(4th grade voice) Write in your DSN what you observe in the demo and how you might explain what is happening.
So how DOES water move on the Earth?

Water also moves UP!
QOD: Where do puddles go after the rain stops?

Guiding questions:
What was going on with the water that was boiling in the demo?
What was different about that water and water at room temp?
What would happen if we put a drop of water on the table and on a paper towel--what would you expect to see and feel in 15 min? Let's do that while we're sorting this out.
So do we need to have the temp at 100 degrees C to get it to change phase from a liquid to gas?
Why or why not?
If there's so much water, why do we need to conserve it?
Let's look at how much water is fresh water on the earth!
What we Know:
Water is wet
A molecule
closed cycle--ice, liquid, vapor
necessary for life
salt water and fresh water on earth
3% fresh water on earth
3/4 of planet covered in it
freezes at 0 C and boils at 100 C
different life needs different types of water
swim, drink, recreate in it, in solid and liquid forms
Two H's and an O
But what is H? What is O?
Building blocks for everything in the universe!!
our guess is...

Common Building Blocks
O is the symbol for...
H stands for...
Let's build some models!!
It's Lego time!
Models are either super big, or super small representations of the real thing--it makes it easier to work with the idea of the real thing--what are some other models we work and play with?
It has been calculated that there are as many water molecules in 10 drops of water as there are stars in the known universe!!!
Check it out!!
This is a video of milk under the microscope! The small spheres are fat masses (that's what makes milk creamy!) and they are being moved by something unseen....
Write your ideas to explain what is causing the movement of the milk fat in your DSN.
Getting to know the Hydrosphere!
Sphere=ball 3-d circle, globe
Bio=living, life
The What????
How does this observation change or impact your thinking about water and how it can change its phases--ice to liquid to gas? Write about that in your Notebook with today's QOD. Leave room for more thoughts!
Is there a reason water moves this way?
Maybe it...
Lets talk about gravity!
Water drawn downward
by gravity creates flow.
The kind of flow, speed of
flow depends on many factors:
Soil type, obstacles in the way,
what else?...

What's the sun got to do with it??

What happened to our water??

On the table--

On the paper--

What would happen if we set them outside on a sunny day?

Okay, this is a simple model, can we think of other ways water goes from Earth to the atmosphere?

What about plants?

Let's take a closer look!
Plant investigation

Here's some fun math :)
Calculate 60% of your body weight:


This is the amount of ounces of water you should drink every day.

Now multiply number of oz. x 0.0295735 L = # of liters you need /day
Your total liters=
Now find the average number of years a human lives:
How many average days is that?
How many liters would an average person drink in a lifetime?

Total liters of fresh water available per person: 7 million


That comes from the total calculated amount of water (100%) on earth divided among all the people (6 bil.) = 233.3 billion liters/person
Minus the 97% of each share that contains salt = 7 billion liters/person
Minus the 80% of that 7 billion equaling the amount frozen at the poles (5.6 billion L frozen) = 1.4 billion L/person
Minus the 99.5% of the 1.4 billion that is unavailable (too far underground, polluted, trapped in soil, etc.) (1.393 billion L unavailable) = 7 million liters/person to use.
What are other ways we use water?
Let's see how we use water every day!
Where on Earth do all 4 spheres come together?
Okay but what's a watershed??
[Crumpled paper activity]
Let's list some ideas:
Sheds usually are used for...

[ hot vs. cold water/food color demo]
[paper proportion activity]
["graduated cylinder" activity]
Who and what else uses water??
[venn diagram]
of a
QOD: What if water was only in
liquid form on earth? Why do you
think it can go from liquid to gas?
The Bigger the MASS the Stronger the PULL toward its center:

An object, like you, has mass and has a gravitational force on smaller objects, like a pencil, pulling them toward your center. BUT the EARTH has SO MUCH MORE MASS than you, that it WINS, and its gravitational force draws all objects toward its center, which for all objects is a DOWNWARD pull. Drop your pencil and it falls downward away from you and toward the center of the earth!
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