

Tom and Mia are twins. They like to play with rocks and dirt. They have a big box of rocks in their room. Some rocks are shiny, some are smooth, some are rough. They call them minerals.
One day, Mom says, "Tom and Mia, behave. We are going to visit Grandma. Put on your nice clothes and pack your toys. No rocks, please. They are too heavy and dirty."
But Tom and Mia do not listen. They sneak some rocks in their backpacks. They think Grandma will like them. They are proud of their minerals.
When they get to Grandma's house, they run to her garden. They see many flowers and plants. They want to show Grandma their rocks. They dig holes in the dirt and bury their rocks. They think they are making a treasure.
But Grandma is not happy. She sees the holes and the dirt on the flowers. She says, "Tom and Mia, what are you doing? You are ruining my garden. Why did you bring rocks? They are not toys. They are tough and hard. They can hurt the plants and your fingers."
Tom and Mia feel sorry. They say, "We are sorry, Grandma. We wanted to show you our minerals. We like them. They are pretty and fun."
Grandma sighs. She says, "I know you like minerals, but they belong in your box, not in my garden. Come, I will show you something else. I have a book about minerals. It has pictures and names and facts. You can learn more about them. But first, you have to clean up the mess. And next time, behave."
