Gather one sample of water from four locales in the city. Place 5 mm of each sample of water in a separate test tube. Take pH paper and dip it into each water sample. Document the pH level of each water sample and compare. Repeat the experiment three times to determine an accurate pH level for each water sample.
Take recycled newspaper and shred it into small pieces. Mix the recycled newspaper with soil in a large container. Label the container as soil with recycled paper. Take three flower pots and label the pots A, B and C. Add the recycled newspaper soil to pots A and B halfway full. Add regular soil to pot C halfway full. Place six pea plant seeds in each flower pot. Add 1 cup of water to each flower pot daily. Compare the growth rate of each pea plant daily and record your observations for three weeks. Repeat the experiment three times to gather accurate data.
Select three cat litter brands. Take three mid-size bowls and label the bowls A, B and C. Fill bowl A with cat litter brand A. Fill bowl B with cat litter brand B. Fill bowl C with cat litter brand C. Pour 2 cups of water into each bowl of cat litter. Check the absorbency of each cat litter brand by pouring the water left in the bowl into a graduated cylinder to measure the amount of water that was not absorbed. Repeat this step for each bowl. Compare the amount of water left from each bowl. The bowl that had the least amount of water left absorbed the most water. Repeat the experiment three times to ensure accuracy.
Take three flower pots and fill each halfway with soil. Label the flower pots A, B and C. Put six bean plant seeds in each flower pot. Place five earthworms in the soil of flower pot A and B. Place 1/4 cup of soil on top of the worms. Do not place the earthworms in flower pot C. Add 1 cup of water to each flower pot daily. Observe the growth rate of the beans in each flower pot in comparison to flower pot C without the worms.