Fun Science Activity

You've probably heard that there's going to be a solar eclipse which will be visible from much of the United States on August 21, 2017.  Beginning about 9:00am Pacific time off the coast of Oregon, the Moon will begin eclipsing the Sun and it will pass across the continental U.S. Depending on what state you live in, you may see a full or partial eclipse. NASA has information about where and when to observe the eclipse.

Definition of a Solar Eclipse:

A solar eclipse occurs when moon passes between the Sun and the Earth, causing a shadow to fall on the the surface of the Earth (blocking the Sun's light).

solar eclipse(Photograph of a solar eclipse for 2008 from NASA)

Solar Eclipse Science

Why are scientists so interested in a total eclipse? First of all it is an opportunity to study the area of plasma flowing around the sun called the solar corona. Normally it is difficult to see the solar corona because it is obscured by the bright light of the sun itself. During a total eclipse, however, that light is blocked and the corona is visible, which allows people to observe and study it.

It is also an opportunity to examine the effects of limiting solar radiation on a smaller scale than occurs when the sun goes down at night.

Why doesn't everyone in the path see a total eclipse? It turns out that when light hits an object, the shadow is not uniform.

The dark center shadow, called the umbra, gets narrower further from the object blocking the light. Only areas in the path of the Moon's umbral shadow will see a total eclipse.

The lighter penumbra shadow gets wider behind an object. Areas in the path of the Moon's penumbral shadow will see a partial eclipse.

Are you going to miss the 2017 eclipse? Don't worry, the next total solar eclipse will be April 8, 2024, passing over the eastern half of the U.S.

Eclipse-Related Science Activities

This summer take advantage of some of the great science activities relating to the solar eclipse. If it passing over your area, visit events hosted by local planetariums and astronomy groups. You can also participate in citizen science projects.

  1. The Sanford Solar Center has tips for observing the sun safely and suggested activities.
  2. California Academy of Sciences has a citizen science project observing behavior of animals during the eclipse (uses the iNaturalist App).
  3. The GLOBE Program has research looking at the impact of Sun's radiation on the Earth's surface. Citizen scientists record air and surface temperatures before, during, and after the eclipse (uses the GLOBE Observer App). Includes instructions for building a wind monitoring device.
  4. NASA has a list of related Citizen Science projects
  5. Take NASA's lunar challenge
  6. Share It Science has instructions for making a pinhole viewer
  7. Read a children's book about eclipses such as :

The beginning reader level book, Eclipses (Amazing Sights of the Sky) by Martha E. H. Rustad

These books feature short sentences and carefully-controlled vocabulary.

See a preview at Google Books.

For older kids, you might want to try this middle grade title, Go See The Eclipse: And Take a Kid with You by Chap Percival


Go See the Eclipse explains what an eclipse is, and gives specific advice on where to go, what to take, and how to prepare. Also contains personal anecdotes about the thrill of viewing a total eclipse.

Paperback: 148 pages
Publisher: Bee Ridge Press; 1a edition (April 24, 2015)
ISBN-10: 0986197521
ISBN-13: 978-0986197529

Interested in reading more? Check out our growing list of books about eclipses at Science Books for Kids.

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Toads are fascinating animals that are too often ignored. The new picture book, The Hidden Life of a Toad* by biologist and photographer Doug Wechsler, brings attention to these neglected creatures.

(*Amazon Affiliate link)

The main text concentrates on toad development and life cycle, complete with photographs of toads mating. Back matter is filled with supplemental information, including a glossary, toad facts, suggestions for helping toads, and details about how the author captured the photographs.

For my full review, see Nonfiction Monday blog.

Related:

Is it a Frog or Toad?

The terms "frog" and "toad" are not scientifically-based, but are common names. According to frog scientists, all frogs and toads belong to the Order Anura and are called "frogs." Although many people call the bumpy, dry land-dwelling creatures "toads" and the smooth-skinned, pond-dwelling creatures "frogs," in reality some species are hard to separate into one or the other group.

This brown, bumpy animal is a toad.

Toad External Anatomy

Have you ever taken a close look at a toad? You may discover some interesting things.

(Illustration based on public domain photo from Visual Hunt)

Starting with the head, prominent features are the bulging eyes. Because they are nocturnal, toads have well-developed night vision. A cool fact is that frogs and toads use their eyes to push food down their throat when swallowing. If you aren't put off by seeing frogs eating bugs, there's a video of frogs swallowing from David Attenborough.

Adult toads have lungs and breathe through opening called nares.

Fun fact:  Toads don't drink water through their mouths, but absorb water through their skin by sitting in it.

Beneath the mouth, male toads have a flexible membrane called a vocal sac. The sac helps amplify the mating calls.

The circular tympanum has a dual function, serving to pass sound vibrations into the ear and also as a protective cover.

Large bumps on the back behind the head, the parotoid glands of toads produce toxic secretions. This is why you should keep pets away from toads and wash your hands after touching them.

A toad has four toes on their forelimbs (front legs) and five toes on the back. Unlike frogs, toads lack webbing between their toes. Both frog and toads are known for their ability to jump with their hind legs.

A .pdf worksheet (with blanks) to download:  toad external anatomy worksheet

Toad Life Cycle

Toads also lay their eggs in water and the eggs hatch into tadpoles.

The dark-colored dots are the frog embryos. They are protected by a gooey jelly-like substance.

The embryos grow into free-swimming tadpoles. They feed and grow, eventually developing legs. Once the tadpoles grow lungs they can move onto land and they are called "toadlets." During that time, their tail disappears.

Activity: Life Cycle Poster

Gather:

  • Pictures of frog and toad life stages from books or the internet
  • Art supplies such as markers, crayons, colored pencils, and/or paint
  • Large sheets of paper

Encourage the children to plan and decorate a poster featuring the stages of a frog or toad life cycle. Don't forget the toadlet stage.

Younger children might benefit from exploring life stage models.

Insect Lore Frog Life Cycle Stages

Where Adult Toads Live

Toads feed on insects and other small creepy crawlies. During the day they rest in moist, shady places. Growing some dense shrubby plants will provide them with cover.

Activity:  Make a Toad House

Instructions for making toad houses are all over the internet. Here are directions for a simple version.

Gather:

  • Clay flower pot at least six inches in diameter
  • Two potato-sized stones
  • Optional:  Acrylic paints and paint brushes

If you desire, have the children decorate the flower pot with acrylic paint. Acrylic markers work, too. Precautions:  Prior to painting, protect the work surface with a washable or disposable covering.

Once the paint is dry, find a moist, shady location outdoors. Overturn the pot and use the two stones to prop up one side. Leave enough room between so a toad can climb under. Make sure the toad house is stable, so it won't slip off the stones and trap the toad inside. Burying it slightly on the back side or covering the back side with a small amount of soil may help stabilize it.

Providing a small tray of water nearby will help keep the area moist. Keep curious pets away and check regularly.

Interested in learning more? See our growing list of children's books about frogs and toads at Science Books for Kids.

Groundhog's Day is coming up soon. It's a perfect time to learn more about this fascinating animal.

Groundhogs have a number of common names. They are also called woodchucks or whistle pigs. Their scientific name is Marmota monax. They belong to the taxonomic group marmots. Groundhogs are rodents, so they have large front teeth or incisors. They also have sharp claws for digging their big burrows.

(Public Domain Illustration)

It is not unusual to see groundhogs sitting next to their burrows or eating plants along highways. Perhaps that's why I've seen them often, but don't have a single photograph.

For older children:

Susan and Joe Sam have spent a great deal of time studying, photographing, and videoing families of woodchucks that live near their home. See their new website, Woodchuck Wonderland™. (Note:  The website does discuss the entire life cycle of the woodchuck, including mating.) They have made many interesting discoveries regarding the family behavior of woodchucks. I highly recommend the photo galleries.

For preschoolers:

Groundhog Day Play By Roberta Gibson

It is February 2, Groundhog Day. Groundhog is looking for his shadow. People say that if he sees his shadow there will be six more months of winter.

Where is Groundhog?

He’s in his burrow.
Can he see his shadow?
No, it’s dark in there.
Where is Groundhog?
Can he see his shadow?
No, he’s behind the big rock.
Where is Groundhog?
He’s behind that tree.
Can he see his shadow?
No, the tree trunk is blocking the light.
Where is Groundhog now?
Can he see his shadow?
No, he’s hiding behind Deer.
Where is Groundhog?
He’s standing out in the sun.
Can he see his shadow?
Yes, he can!
Back to bed Groundhog. You can sleep for six more weeks.

Related:

Earlier Groundhog's Day Science post with shadow activities