Next week, October 14-20th, is Earth Science Week. It is a way to promote awareness of important Earth Science topics and the importance of Earth Science in education.
The theme for this year is "Discovering Careers in the Earth Sciences." There are classroom activity ideas and resources, including materials, lesson plans, and more at the site.
There are some really good materials available online and you can also order a full classroom kit of materials, for a small fee, from the site. Past years' kits are also available.