Sunday, January 29, 2012

October/November 2011 Science Activities

Patterns in nature:
“Nature uses only the longest threads to weave her patterns, so that each small piece of her fabric reveals the organization of the entire tapestry.” - Richard P. Feynman, physicist and author

A spiral in a sunflower or a seashell, the symmetry of a leaf, and the synchronous flight of a flock of birds are only a few of the patterns that nature displays.  Nature’s patterns yield both a rich display and a glimpse of the underlying order in our world.

We can learn a great deal about design from studying the patterns found in natural systems.  Also, understanding the concept of patterns, and being able to recognize them, helps us understand such things as the classification of plants and animals.  In solving a problem, understanding patterns lets us see how the various pieces of information relate to each other, and can aid in predicting a solution.

I introduced the concept of patterns in nature by reading “Swirl by Swirl – Spirals in Nature” by Joyce Sidman.  This book is a beautifully illustrated study of patterns in nature, specifically revealing the many spirals in
nature – from sea shells to fern fronds and ocean waves, from a flower bud to a distant galaxy and even inside the ear - and celebrating their beauty and value.

To begin our study of spirals in nature, the children looked at pictures of spirals and then studied spiral patterns in seashells.  We then made a more detailed study of the spiral pattern of sunflowers and learned about the anatomy of the sunflower plant.  The children also practiced drawing spirals.


Seasons:
I introduced our study of Fall by reading “Leaf Man” by Lois Ehlert.  Fall has come, the wind is blowing, and a Leaf Man's got to go where the wind blows.  With illustrations made from actual fall leaves this book celebrates the season and the rich imagination of children.

Signs of fall:
Learning is all around.  Using all five senses we explored the wonders of Fall.  Watching leaves fall from the trees – hearing them crunch under our feet as we walked through them.  We raked them up and smelled their scent - feeling their brittleness - as we added them to the compost bin.  It's time to gather seeds from our garden to be used for planting next year. We watched squirrels gather seeds (acorns) as well and observed birds gathering sunflower seeds from the drooping flower heads.

We noticed how Canadian Geese gather together and begin to fly south in the fall. We looked overhead for their familiar V formation and listened to them honking to each other. What do you think they were saying?  Look at the V shape formed by the geese as they fly. Does this formation help them on their journey?

Activities:
Art activities included pressing leaves onto colorful ink pads and making leaf prints on paper in creative designs.  We also collected leaves and made our own leaf figures inspired by the “Leaf Man” book.

Our science activity was a leaf study in which we compared differences and similarities between leaves and learned which trees they came from.  We also sorted leaves for various attributes (color, symmetry, size) and counted leaves -  graphing the results to see how many of each kind of leaf we had found.

Other books read included:
“In a Nutshell” by Joseph Anthony
Beautiful illustrations and lively text depict the life cycle of an oak – beginning with an acorn - and how it supports life, even after it is gone, when its energy passes into many other life forms.

“A Seed is Sleepy” by Dianna Hutts Aston
This gorgeous and informative book introduces children to a number of seed and plant facts, making it a valuable nature guide that can be read at home or in a classroom reading circle.

“The Tiny Seed” by Eric Carle
A strong wind blows flower seeds high in the air and carries them far across the land.  Many of the seeds are lost but some survive and sprout into plants that grow and flower, producing their own seeds to start the process over again. A wonderful nature lesson, and an inspiring message about the importance of perseverance.


Gardening:
I introduced garden activities by reading “Herman and Marguerite an Earth Story” by Jay O’Callahan.  This is the story of Herman, a shy earthworm, who spends most of his time in the dark earth, eating dead leaves and making tunnels. He doesn’t think what he does is very important.  He meets Marguerite, a “dogapillar,” who lives in the orchard above, where she munches on plants, and waits for the time when she will become a butterfly.


Herman and Marguerite become friends even though they are very different and through their friendship they learn to believe in themselves, and on the way help each other bring life back to a lonely orchard.

Garden activities included:
• Preparation of beds – digging with kids
• Planting with kids – vegetables, bulbs & CA poppies
• Learning plant life cycles – seeds, flowers, etc.
• Studying decomposition in the compost and worm bins
• Learning about insects in the garden – beneficials and ones    that are not; observed a Katydid and heard its song; studied insect body parts
• Observations – kids took digital pictures of their individual gardens

Also read:
“Compost – Growing Gardens from Garbage” by Linda Glaser
In this delightfully illustrated book, a little girl explains how her family turns garbage and garden waste into soil using their compost bin. She helps water the pile, watches her mother turn it, feels the heat of the compost, and helps spread it on the garden for spring planting. 

September 2011 Science Activities


To introduce the children to the Water Cycle, I read  “All the Water in the World” by George Ella Lyon.  The wonderful illustrations and poetic text of this book educate about the water cycle and reinforce the simple, yet profound message: water gives life.

Evaporation, Condensation, Precipitation
Water that falls from the sky today has been around since before the time of the dinosaurs. So how does the earth keep reusing the same water and what is the water cycle?

Discussion:  In the water cycle, water falls to the earth as rain (precipitation).  When rain falls on the ground some is used by plants and animals and some sinks into the dirt and can form underground rivers and streams.  Rain also collects, into lakes, rivers and the oceans where it evaporates into vapor when the sun heats these surfaces.  Plants and animals also lose water to evaporation.  When the water vapor rises high enough into the sky it cools down and condenses as water droplets (clouds) and then returns to the earth as rain or snow.  And the Water Cycle continues on and on….

Using a poster of the water cycle (which they helped put together) reinforced this discussion with the children.

I also did a simple demonstration that illustrated the different steps of the water cycle, and the different states of water (solid, liquid, gas).
I boiled water in a pot with a glass
lid.  As the water heated, droplets of
water condensed on the lid.

Then the children helped with two simple experiments on condensation.  In one experiment each child took a turn breathing onto a mirror to see how their warm breath would condense on a cooler surface.  In another experiment they helped load ice into several large cans and then felt the outside of the can as water droplets formed on the surface.  I posed the question “Where does the water on the can come from?”  We discussed how the water got there as the warm air hit the colder surface of the can and condensed on the outside of the can.

Properties of Water
Objective: To familiarize students with the various properties of water and to study two properties: surface tension of water, water as a solvent.

SURFACE TENSION OF WATER (water has a “skin” and water “loves” water)
Experiment #1
Materials:
         4” X 4” flat piece of plastic
         eyedropper for each child
         small container of water
         small container of dish soap w/several eyedropper in it
Procedure:  Each child used an eyedropper to drop water on a sheet of plastic to observe how the drops added to each other to build one large drop.  Children then introduced a small amount of dish soap to the large drop and watched the drop disperse.

Experiment#2
Materials:
         one nickel & one dime / child
         eyedropper for each child
         small container of water
         small container of dish soap w/several stoppers in it
Procedure:  Each child used an eyedropper to drop water on a coin, first a nickel and then a dime.  As we dropped the water on the coins we counted the drops to see which coin could hold the most drops. Children then introduced a small amount of dish soap to the large drop on each coin and watched the drop disperse.

Explanation: The water molecules are attracted to one another, but not to air molecules. So, as long as they possibly can, the water molecules will stick together rather than dispersing.  This tendency of water molecules to stick together is called "surface tension." A surface tension gives water the appearance of having a "skin".  This is why small droplets of water stay in a round shape rather than spreading out in all directions.  Some animals, like water striders, exploit surface tension to walk on water!  But surface tension can be weakened.

Questions for discussion:  What do children think will happen if they keep adding drops?  Why hasn’t the water spilled over the edge of the coins?  What will it take to make the water spill?

WATER AS A SOLVENT
Ocean in a Bottle
Some liquids mix with water and others don’t. This is because some liquids are denser than others. For example, when oil and water are mixed together the oil always rises to the top because it is less dense than water. By placing both oil and water in a container and adding a few drops of food coloring the color will mix with only the water since it is of the same density and not mix with the oil.

What You'll Need:
Funnel
Clear soda bottle
Water
Cooking oil
Blue food coloring

Step 1: Using a funnel, pour water into a soda bottle until it is about 2/3 full.
Step 2: Using a funnel, pour oil into the same soda bottle almost to the top.  The oil and water do not mix.
Step 3: Add a few drops of blue food coloring and watch as the drops of food coloring pass through the oil layer and only mix with the water.
Step 4: Put the top back on tightly, and gently tilt the bottle back and forth to create an ocean wave effect.




Water

Water flows from high in the mountains
Water runs deep in the Earth
Miraculously, water comes to us,
And sustains all life.
Thich Nhat Hanh (teacher, author, poet and peace activist)

The overall theme for science in the Primaria classroom is the study of Water – what are the different states and properties of water, where does it come from, how is it used, why is it important, and where does it go.  This is accomplished through a two-year study of watershed from the Sierra Nevada Mountains to the Pacific Ocean.  Science activities include: simple, hands-on experiments in class; field trips; investigations of plants and animals; and gardening.

Activities chosen for exploring science concepts are all designed to stimulate the children’s natural curiosity and many can be easily reproduced at home.  Activities will build on early concepts as we move through the school year.  Not only will specific science activities be done, but science will also be integrated into art, Spanish, literacy, social studies, and math.

We started the year by learning about:
•  the water cycle - evaporation, condensation, precipitation
•  the states of water - solid, liquid, gas
•  some properties of water - surface tension “water loves water/water has a skin”; water as a solvent
As an introduction to the garden we:
•  learned about patterns in nature
•  did garden observations, prepared garden beds, planted beds w/vegetables & flowers
•  learned about plant life cycles and about insects in the garden
We also discovered what a watershed is and learned about:
•  salmon and their migration, life cycle…..
•  migration of whales, monarchs and birds (made bird feeders for migrating birds)
•  zonation in the ocean

The next three entries give more details about the activities outlined above.