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This hands-on lesson will get your students to investigate some mystery liquids, and they will have to use their observational skills to figure out what they are.

Liquid Detectives

This fun and interactive lesson will teach your students the scientific method to find out if something sinks or floats with a little help from Cookie Monster.

Sink or Float with the Cookie Monster

Introduce your students to the scientific concept of sink or float. This hands-on experiment allows them to see which objects sink and which float. The concepts taught will be solidified with the completion of worksheets.

Sink or Float

This is a fun way to introduce kids to the concept of volume, and give them a quick hands-on activity to boot.

Understanding Volume

Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

Oobleck Science: Solid or Liquid? 

In this Halloween-themed activity, young learners will find out what happens when they mix two household items together to create a surprising chemical reaction.

Growing Jack-o'-Lantern

Use reusable, recyclable materials--along with a dose of imagination--to build a castle with first grade geometrical forms.

Build a Castle...and Explore First Grade Geometry!

Here's a classic celery science experiment that uses celery and food coloring to demonstrate how plants absorb water.

Celery and Food Coloring Experiment

Here's a fun activity to help build thinking skills in young first grade scientists, and to encourage them to have a blast exploring the mass and volume.

Weight Wonders: Big and Light...Heavy and Small?

It's easier than you think to make homemade play dough -- just a few pantry staples makes a natural version of the toy that kids have loved for generations.

Homemade Playdough

This classic children&#39;s game-connecting two cups with a string-demonstrates sound&#39;s ability to travel through air vs through a solid.

The Speed of Sound on a String

Explore the scientific concept of capacity by seeing how many pennies you boat can hold before it sinks!

Sinking Ships for Science

This worksheet uses a paper bird to demonstrate center of gravity, and practices following directions and fine motor skills.

Balancing Bird: Learning About Gravity

This classic children&#39;s game demonstrates how sound travels through air vs. through a solid.

How Sound Travels Through Air and Solids

In this sound experiment children listen for differences as they tap on a bag of air, a bag of water, and a wooden block held up to their ears.

How Well Does Sound Travel Through a Gas? A Liquid? A Solid?

Walk, sleep, run, eat! We're constantly using energy, whether we're moving or not. In this lesson, students learn how their bodies are constantly converting potential energy into kinetic energy and kinetic energy back to potential energy.

Potential And Kinetic Energy

What&#39;s a liquid? What&#39;s a solid? What better way to experiment than by turning a childhood favorite, ice cream, into a homemade science lesson!

Ice Cream Science

Bring the magic and mystery of the night sky to the light of day with this fun constellation art project!

Make Window Constellations

First grade science often covers solids, liquids, and gases. This silly science explores serious facts about the difference between all three.

Dancing Raisins

Here's a science activity that lets a first grader use an empty dish detergent bottle to create his own fountain as he explores air pressure.

Air Pressure Experiment

Kids write down examples of solids, liquids, and gases in this 1st grade physical science worksheet that focuses on the states of matter.

Matter Mixup: Writing Solids, Liquids, and Gases

This easy Halloween-themed science experiment for first-graders is perfect for chilly October afternoons or great as a Halloween party activity.

Spooky Science Experiment

For each item on this first grade science worksheet, kids match a piece of clothing with the thermometer showing a temperature for wearing the item of clothing.

Temperature: Hot or Cold?

Chemistry is a blast with this backyard bomb made from a sandwich bag. All you need are ingredients from the pantry to create a satisfying, and safe, explosion.

Create a Sandwich Bag Explosion!

Engineers in training can get started with this simple wheel-and-axle construction activity.

Wheels and Axles

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