20 Simple and Fun Second Grade Science Experiments and Activities

Drink root beer floats … in the name of science!

Second Grade Science Experiments and Activities

There’s no better way to learn about the world around us than through hands-on exploration. These second grade science experiments, projects, and demonstrations will help kids understand earth science, properties of matter, and much more, and they’re easy enough that any teacher can tackle them!

1. Conduct a cookie dunk experiment.

2nd Grade Science

Introduce or review the scientific method with a fun and easy experiment to determine which cookies float or sink when dunked in milk. Then you can eat the results! (Find more great edible science experiments here.)

Learn more: Around the Kampfire

2. Find out which liquid is best for growing seeds.

As you learn about the life cycle of plants, explore how water supports their growth. Plant seeds and water them with a variety of liquids to see which sprout first and grow best.

Learn more: Lessons 4 Little Ones

3. Make it rain in the mountains.

2nd Grade Science

Explore the way rain in the mountains leads to rivers that flow to the ocean. The concept is so simple: Second grade science students crumple a piece of paper to create mountain peaks and valleys. Then, they spray colored water to create “rain” and see where the water goes.

Learn more: Science 19 Experiments

4. Build a folded mountain.

Speaking of mountains, this clever demonstration helps kids understand how some types are formed. Use layers of towels to represent rock layers and boxes for continents. Then pu-u-u-sh and see what happens!

Learn more: The Chaos and the Clutter

5. Freeze and observe liquid expansion.

2nd Grade Science Education com

As you explore the states of matter, experiment to see if some types of liquid expand than others more when frozen.

Learn more: Education.com

6. Pollinate plants with insects.

2nd Grade Science

Help second grade science students see pollination in action! Make a fuzzy “bug” with pom-poms and pipe cleaners, and create “flowers” from cupcake wrappers filled with pollen-like coffee grounds. Then, have the insect visit each flower and observe how the pollen grains stick and mix. If the season is right, take your “bugs” outdoors and try this on some real plants.

Learn more: The First Grade Roundup

7. Explode a balloon seed pod.

2nd Grade Science

After you learn about pollination, take the next step and explore how plants disperse their seeds far and wide. One way is with exploding seed pods. Use a balloon to see how it works.

Learn more: Around the Kampfire

8. Discover density with salt water solutions.

This simple experiment covers a lot of second grade science concepts. Learn about solutions, density, and even ocean science as you compare and contrast how objects float in different water mixtures.

Learn more: Science Kiddo

9. Create an earth model from Play-Doh.

2nd Grade Science

Play-Doh has so many uses in the classroom! Use it to teach second grade science students about the layers of the earth by building a fun and colorful model.

Learn more: The Crafty Classroom

10. Explore erosion with sugar cubes.

Simulate the effects of erosion by shaking sugar cubes in a cup with some pebbles to see what happens. Get more ideas for second grade science activities about erosion and weathering at the link.

Learn more: The First Grade Roundup

11. Recreate the water cycle in a bag.

2nd Grade Science

Fill a plastic bag partway with water and set it on a sunny windowsill to see how the water evaporates up and eventually “rains” down.

Learn more: Grade School Giggles

12. Design and build an index card tower.

Challenge your second grade science students to a little early engineering! Given only index cards, how tall and/or strong of a structure can they build?

Learn more: Education to the Core

13. Drink root beer floats to learn about states of matter.

2nd Grade Science

What’s easy to make, delicious to eat, and demonstrates all three states of matter at once? Root beer floats! This will easily be your students’ favorite science lesson of the year.

Learn more: Learning Lab Resources

14. Grow a self-sustaining ecosystem.

Plant seeds inside a sealed plastic bottle and observe both the water cycle and the plant life cycle in one simple second grade science experiment.

Learn more: Carly and Adam

15. Compare and contrast animal habitats.

2nd Grade Science

Build a variety of habitats (woodland, arctic, savannah, etc.) and then have kids compare to see how they are similar (all have water) and how they are different (trees, temperatures, etc.).

Learn more: Edventures With Kids

16. Use crackers to learn about properties of matter.

Practice sorting, comparing, and classifying using properties of matter in this tasty experiment. All you need is a variety of snack crackers and inquiring minds!

Learn more: Around the Kampfire

17. Discover plate tectonics with graham crackers.

2nd Grade Science

Use graham crackers as the earth’s crust floating on a bed of whipped topping “mantle” to learn about how tectonic plates interact.

Learn more: The Chaos and the Clutter

18. Collect and classify rocks.

Take a nature walk to pick up rocks of all kinds. Bring them back and have kids examine them closely and sort them into groups by properties (color, size, shape, texture, and so on). This is a fantastic lead-in to learning about the types of rocks.

Learn more: Rhythms of Play

19. Build a body from Play-Doh.

2nd Grade Science

Here comes Play-Doh again! Hit the link below for free printable mats to use as you have your second grade science students sculpt the bones, organs, and muscles of the body.

Learn more: 123Homeschool4Me

20. Build magnet-and-paper clip trees.

Experiment with magnet properties like polarity and strength by building cute little trees! This is also an excellent way for kids to find out which items are magnetic and which are not.

Learn more: Preschool Powol Packets

Looking for more? Find fun experiments for third grade science students here.

Love science, but on a budget? Try these 10 Dollar Store Science Experiments!

20 Simple and Fun Second Grade Science Experiments and Activities

Posted by Jill Staake

Jill Staake is a writer living in Tampa, Florida. She's spent most of her life teaching in traditional classrooms and beyond, from 8th grade English to butterfly encounters, and believes learning is a life-long process.

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