There’s plenty of opportunities to enjoy Earth Day science inside or outside! This simple to set up but amazingly fun Earth Day science activity is perfect for kids of all ages to explore! Try kitchen science with a homemade lava lamp that explores liquid density and a cool chemical reaction. Simple science for the win!

LAVA LAMP EARTH DAY SCIENCE ACTIVITY!

I always think of blue and green when I think of Earth Day. Although this Earth Day theme science activity isn’t doing something directly to save the Earth, it’s sparking the curiosity of our future scientists who will have a huge impact on our world.

MORE EARTH DAY SCIENCE HERE

Between planting seeds, doing community clean ups, or learning about pollution, it’s definitely ok to experiment with another kind of Earth Day Science! Explore playful chemistry and learn a little bit about why oil and water don’t mix.

Look below! That’s some really cool science. The first time we used one jar and combined blue and green food coloring which you can see below. The following pictures show two jars!

EASY EARTH DAY THEME SCIENCE

The best part of this Earth Day science activity is just how easy it is to set up! Walk into the kitchen, open your pantry and find everything you need to create a homemade lava lamp and check out liquid density.

This is also a simple science activity to bring into the classroom because it’s so cost effective! Make sure to read up on the simple science at the end of this page.

SUPPLIES

Cooking oil (baby oil is clear and looks pretty but it’s not as cost effective as a large container of cooking oil)

Water

Food Coloring (green and blue for Earth Day)

Glass Jars (1-2)

Alka Seltzer Tablets (generic is fine)

Look for our FREE printable science experiments below!

EARTH DAY SCIENCE SET UP

Step One is always to gather your ingredients! We started with one jar for both blue and green food coloring and then decided to separate the colors into their own jars.

Fill your jar(s) about 2/3 of the way will oil. You can experiment with more and less and see which one gives the best results. Make sure to keep track of your results. This is a great way to turn a science activity into an experiment.

How else you can you change up the activity? What if you didn’t add oil at all. What if you change the temperature of the water?

Next you want to fill your jar(s) the rest of the way with water. These steps are great for helping your kids hone their fine motor skills and learn about approximate measurements. We eyeballed our liquids, but you can actually measure out your liquids.

Make sure to observe the oil and water in your jars. Have you ever made a DENSITY TOWER

Add drops of food coloring to your oil and water and watch what happens. However, you don’t want to mix the colors into the liquids. It’s ok if you do, but I love how the chemical reaction looks if you don’t mix them!

Now it’s time for the grand finale of your Earth Day science activity! It’s time to drop in a tablet of Alka Seltzer or it’s generic equivalent. Make sure to watch closely as the magic starts to happen!

Save a few tablets for these Alka Seltzer rockets too!

Notice the tablet is heavy so that sinks all the way to the bottom. You may have already observed that water is also heavier then the cooking oil.

The chemical reaction between the water and the alka seltzer starts to take shape as you can see below and the bubbles or gas that it is produced during the reaction pick up blobs of color!

This reaction will continue to pick up speed. We share a fun video on our FB page of how cool it looks.

The reaction will continue for a few minutes, and of course you can always add another tablet to continue the fun!

SIMPLE LAVA LAMP AND EARTH DAY SCIENCE

There’s quite a few learning opportunities going on here with both physics and chemistry! Liquid is one of the three states of matter. It flows, it pours, and it takes the shape of the container you put it in.

However, liquids have different viscosities or thicknesses. Does the oil pour differently then the water? What do you notice about the food coloring drops you added to the oil/water? Think about the viscosity of other liquids you use.

Why don’t all liquids simply mix together? Did you notice the oil and water separated? That’s because water is heavier then oil. Making a DENSITY TOWER is a great way to observe how not all liquids weigh the same.  Liquids are made up of a different numbers of atoms and molecules. In some liquids, these atoms and molecules are packed together more tightly resulting in a denser or heavier liquid.

Now for the chemical reaction! When the two substances combine (tablet and water) they create a gas called carbon dioxide which is all the bubbling you see. These bubbles carry the color water to the top of  the oil where they pop and the water falls back down.