Passage (approx. 120 words): Emma loved collecting rocks. One spring she found a smooth, green stone near the stream behind her house. She polished it until the surface shone and kept it on her windowsill. Neighbors often asked about her collection; some thought it was just pretty, but Emma liked remembering where each rock came from. When a school science fair invited students to present a small research project, Emma decided to learn how different rocks form. She tested hardness, color, and texture, and discovered that many local stones were fragments of larger rocks shaped by water.