Here are a few easy eggshell science projects that are suitable for kids. Don't forget the scientific method as your kids complete their eggshell science experiments. Grab free printable worksheets outlining the scientific method to use with your kids! Eggshell Dissolving Experiment: Materials needed: Eggshells, vinegar, clear cups or containers Procedure: Gently place eggshells in separate cups or containers. Pour vinegar over the eggshells until they are fully submerged. Observe and record changes in the eggshells over time. Note any bubbling or fizzing, and measure how long it takes for the eggshell to dissolve completely. Explanation: Vinegar is an acid that reacts with the calcium carbonate in the eggshell, causing it to dissolve. This experiment demonstrates the process of chemical erosion. Eggshell Strength Test: Materials needed: Eggshells, books or weights of different sizes, ruler or measuring tape Procedure: Carefully place an eggshell on a flat surface. Gradually place books or weights on top of the eggshell until it cracks. Measure and record the weight or number of books required to crack the eggshell. Repeat the process with different weights or sizes of books. Explanation: This experiment helps determine the strength of an eggshell. The more weight or pressure required to crack the eggshell, the stronger it is. Eggshell as a Seed Starter: Materials needed: Eggshells, potting soil, seeds, egg carton or tray Procedure: Clean and dry eggshells, leaving a portion intact. Fill each eggshell with potting soil and plant a seed inside. Place the eggshells in an egg carton or tray, ensuring they stand upright. Water the eggshells regularly and observe seed germination and growth. Explanation: Eggshells can be used as biodegradable seed starters. The eggshell provides nutrients like calcium to the growing seedling, and it can be planted directly into the soil once the seedling is ready.