One sunny day, Mia went to the beach with her friends. They built a tall sandcastle, making sure to add many shells as decorations. Mia was proud of their work and wanted to keep it safe. So, she found a twig and stuck it at the top, hoping it would stay intact even when the waves came in. As they played, the tide slowly rose, and the water began to creep closer to their masterpiece. Mia felt nervous, hoping the sandcastle would not be washed away.