Weathering with Conversation Hearts: A Sweet Science Experiment

Understanding weathering—the process that breaks down rocks into smaller pieces over time—is a fundamental concept in earth science. With this simple and engaging experiment, students can observe mechanical weathering in action using Conversation Hearts candy. This hands-on activity is perfect for demonstrating how rocks break down due to physical forces like wind, water, and abrasion.

Materials Needed:

• Conversation Hearts candy (or any small, solid candy)

• Small container with a lid (such as a plastic food storage container)

• Small pebbles or aquarium gravel

• Paper and pencil for observations

Procedure:

1. Initial Observations: Give each student a few Conversation Hearts. Have them examine the hearts carefully, noting their shape, color, and any imprinted messages. Students can record their observations in a science journal.

2. Simulating Weathering: Place the Conversation Hearts in the container along with a handful of small pebbles or aquarium gravel. Secure the lid tightly. Instruct students to shake the container vigorously for about 30 seconds to 1 minute. The pebbles act like natural forces such as wind and water that cause rocks to collide and wear down over time.

3. Observing Changes: After shaking, pour out the Conversation Hearts onto a tray or paper towel. Have students observe and record how the candy has changed. They should notice that the edges may have softened, colors may have faded, and small fragments may have broken off.

4. Discussion and Connection to Weathering: Discuss with students how this experiment models mechanical weathering. Explain that, just like the candy pieces breaking down due to friction and impact, rocks in nature are weathered by physical forces like flowing water, wind, and ice.

Extension Ideas:

• Time Variation: Have students shake the container for different lengths of time and compare results.

• Different Materials: Try using different types of candy to see if some weather faster than others.

• Real-World Connections: Show images of weathered rock formations, such as smooth river stones or eroded cliffs, to help students connect their observations to real geological processes.

This simple yet effective experiment brings an abstract concept to life in a way that’s engaging and memorable for students. Plus, it’s a great excuse to use some extra candy after Valentine’s Day!

Need a review activity? Check out my Science Boom Cards - a no prep, self-checking digital activity for students to use either in the classroom (fast finishers) or at home for extra study time.