Category: Compost Science

STEM Friday #Kidlit We Dig Worms!

For STEM Friday we have the combined natural history comic and leveled reader for kids, We Dig Worms by Kevin McCloskey.

Kids of all ages are attracted to cartoons. The art helps tell the story and the humor makes it fun to read.

However, that doesn’t mean cartoon illustrations shouldn’t be taken seriously. This book has an underpinning of solid scientific facts. For example McCloskey shows the anatomy and life cycle of earthworms,

emphasizes the importance of earthworms in their natural habitat — as food for other animals, for their role in the decomposition of plant waste, and as aerators of the soil —

and includes discussions of earthworm behavior.

Earthworms are great!

On repeat readings, you will likely notice other details that make We Dig Worms a special experience. At the beginning of the book (end papers), a worm is coming out of its burrow. At the end, the worm goes back into its burrow. Also, the illustrations are done on paper grocery bags to emphasize the theme of recycling. There is a lot to observe and talk about.

As if that weren’t enough, in the back matter are tips and suggestions for parents and teachers on how to read comics with kids, with emphasis on going “for the shared pleasure.” Wonderful!

We Dig Worms is a resource that young readers will want to return to again and again. Pick up and enjoy a copy today!

Suggested activities to accompany the book

Looking for a project on earthworms? You might want to consider vermiculture (worm composting). Providing a safe habitat for worms, feeding them, and being able to observe them closely can lead to valuable learning. All it requires is a container, bedding (like shredded newspapers and paper bags), vegetable food scraps, and worms (available at bait shops and from worm farms).


Age Range: 4 – 8 years
Publisher: TOON Books (April 14, 2015)
ISBN-10: 1935179802
ISBN-13: 978-1935179801

Disclosure: This book and the copyrighted illustrations were provided by the author. Also, I am an affiliate with Amazon so I can provide you with cover images and links to more information about books and products. As you probably are aware, if you click through the highlighted title link and purchase a product, I will receive a very small commission, at no extra cost to you. Any proceeds help defray the costs of hosting and maintaining this website.

Come visit the STEM Friday blog each week to find more great Science, Technology, Engineering and Math books. Note: this is a new link as of 10/2018.

#Kidlit for STEM Friday: Leaf Litter Critters Poetry Book

Here at Growing With Science we love both creepy crawlies and science poems, so imagine our excitement when we discovered the new middle grade book, Leaf Litter Critters by Leslie Bulion and illustrated by Robert Meganck.

Each two-page spread in the book features a vocabulary-rich science poem about the leaf litter ecosystem, as well as a “Science Note,” which is a paragraph or two of background information to support the poem.

For example, here’s one of the poems (most are much longer):

Rove Beetle

Velcro-tongued predator
snags maggots, mites, snails, and slugs
soil pest control
requires a flexible
appetite and abdomen

The accompanying “Science Note” explains how rove beetles fit into the “brown food web,” and also how their abdomens differ from those of most beetles.

The digital illustrations add a fun element. They range from somewhat realistic to full-blown cartoon.

Leaf Litter Critters is a serious text that might just entice some readers who prefer fiction to explore a less-than-glamorous ecosystem. It’s also perfect for those who enjoy their poetry on the sci-ency side.

Don’t forget our giveaway for the picture book What Do They Do With All That Poo? ends tomorrow! The giveaway is now closed.

Age Range: 8 – 12 years
Publisher: Peachtree Publishers (March 1, 2018)
ISBN-10: 156145950X
ISBN-13: 978-1561459506

Related Activity Suggestions:

See our previous compost science projects for kids post.

Want more information? Visit our growing list of children’s books about composting and decomposition at Science Books for Kids.

Disclosure: This book was provided by our local library. Also, I am an affiliate with Amazon so I can provide you with cover images and links to more information about books and products. As you probably are aware, if you click through the highlighted title link and purchase a product, I will receive a very small commission, at no extra cost to you. Any proceeds help defray the costs of hosting and maintaining this website.

Come visit the STEM Friday blog each week to find more great Science, Technology, Engineering and Math books.

Compost Science Projects for Kids

Today we are joining with Share It! Science News blog in a kid-friendly investigation of composting. Here at Growing With Science we have activities to explore decomposition and the organisms found in compost. Share It! Science News is delving deep into composting with earthworms (vermicomposting). Be sure to go over and see what earthworm eggs look like.

Compost Science

Spring is a perfect time to add last year’s compost to the garden and start this year’s compost heap. While you are at it, why not incorporate some science activities for children?

Activity 1. Exploring Decomposition

Decomposition is an incredibly important process. Things rotting and decaying may not be pretty, but imagine what the world would be like without decomposition. Dead organisms would pile up and the nutrients tied up in them would not be released to be used again.

Test to see whether the addition of soil speeds up decomposition.

Note:  The observation portion of this experiment will take two to four weeks depending on materials used, temperature, and humidity. Also, set up outdoors or in a well-ventilated area and warn children not to disturb, inhale, or eat decaying materials.


  • Clear containers, gallon-sized or bigger, if possible
  • Squares of fabric to cover container
  • Rubber bands to hold cloth covers in place
  • Plant debris, like leaves, grass clippings
  • Fruit and vegetable scraps, grains (no meat)
  • Soil, potting mix, or finished compost
  • Cup to measure soil and water
  • Water source
  • Optional:  man-made materials (to check if they are biodegradable)
  • Optional:  thermometer

Prepare two containers with identical mixes of plant material and the same amount of water (enough to make damp).


Add a cup of soil, potting mix, or finished compost to one container.

decomposition-experiment-2Observe the two containers daily and record which one seems to contain materials that are decomposing more quickly. If there is a thermometer available, record the temperature of the mix each day. Add water as needed (same amount to both containers). Compare and discuss your results when completed.

Note:  Too much water will cause anaerobic conditions or lack of oxygen. The microorganisms that grow under anaerobic conditions tend to smell really bad. If that happens and you want to try to save the experiment, pour off the excess water and stir in some dry leaves or grass clippings (same amount in each container).

Extension 1:  Prepare more containers to compare the effect of adding soil versus potting soil and/or finished compost.

Extension 2:  Add various man-made materials to test to see if they are biodegradable. Examples might be different types of packing peanuts, pieces of Styrofoam, pieces of plastic bags, cardboard, or different types of paper.

Activity 2. Discovering Critters in the Compost

A compost pile is a community of living things that are dependent on each other. Microorganisms such as bacteria, yeasts and molds are at the forefront of the decomposition process. Helping them (or eating them) are the invertebrates. The invertebrates help the microorganisms by tearing up or breaking up the larger pieces of plant material and by moving microorganisms about on their bodies. Remember that a compost pile that is working optimally will be too hot to harbor much besides microorganisms.

Compost.bin(Photograph of compost bin in public domain at Wikipedia)

Look through a sample of compost to see what critters are found hiding there.


  • Magnifying lens
  • Dissecting microscope, if available
  • Petri or specimen dish to hold sample
  • Tweezers, forceps or a small stick to poke through compost
  • Small paintbrush to remove debris and move tiny creatures
  • Paper and pencil to make drawings and record results
  • Gloves (optional)
  • Identification guides, or take a look at descriptions of compost critters

What invertebrates should you expect? (Links go to related Growing With Science posts)


beetles, crickets, cockroaches, ants, flies like fruit flies, silverfish, or earwigs

2011-antsCrickets, cockroaches, some flies, and some beetles feed on the plant materials added to compost. The ants, riparian earwigs and most beetles will be feeding on other creatures living in the compost pile or bin.

Snails, slugs

snail-2Slugs and snails may feed on leaves of plants added to a compost pile and help break up large pieces.





All the arachnids feed on other animals (are predators).

Millipedes, centipedes


Millipedes feed on decaying plant materials. Centipedes are predators of other animals.



Earthworms help make big pieces of plant materials smaller. See Share It! Science News for how to compost with worms.

Sowbugs, Pillbugs


Sowbugs and pillbugs also feed on decaying plants.

Nematodes (round worms)

Nematodes are by far the most abundant invertebrate found in compost heaps. They are tiny hairlike worms usually visible only under the microscope. It has been estimated that a single rotting apple may contain as many as 90,000 nematodes!


  1. See our post with composting activities to accompany the Rotten Pumpkin Book
  2. Our post about decomposing tree leaves
  3. Compost Stew Book Author Website has loads of links to compost lessons, games, information, etc.
  4. Compost Stew lesson plan from Books in Bloom (download here)
  5. Resource for older children:  food web of the compost pile illustration (download here)

Try our growing list of children’s books about decomposition and compost at Science Books for Kids.


Follow Roberta’s board Compost Science for Kids on Pinterest.