If you teach younger children, you can take them to your school’s playground, or take them on a short field trip to a place that has gravel. If you can’t do either of these things, then perhaps you can bring in a bucket of gravel for a classroom-based activity. Whether outside or inside, they can touch and examine the gravel, asking and answering questions about where it might have come from, what’s in it, and how it might be transported from the playground to another place (i.e. on the bottoms of shoes, in children’s toys, etc.).
Older children can also do this activity. (See this Scholastic article on the benefits of hands-on classroom activities.) Teachers with laboratory facilities might also want to use microscopes so that students can examine, document, and discuss the different parts of gravel that they have. Older children can also make use of NASA’s images that are being taken by Rover.
Curiosity is on a two-year mission, so there will be plenty of time to think about, discover, and implement interesting ways to use it in the classroom.