How do clouds form, why do so many types exist, and what can clouds reveal about the weather and climate to come? In this lab from the Public Broadcasting Service's series NOVA (http://to.pbs.org/15tuRIz) , students in grades 7-12 learn to classify clouds and investigate their role in tropical storms. Comes with Educators' Guide.  

Let your students' tract the ever-changing world with the help of the U.S. Geological Survey (USGS) website. USGS uses remote sensing images to show examples of environmental changes over time throughout the world.   

Introduce middle school students to biodiversity and sustainability issues with these videos from the Into the Outdoors Entertainment and Educational Network. The videos at www.intotheoutdoors.org blend serious science content with outdoor adventure, showing students that creating solutions for a healthy planet is both necessary and fun. Each video includes a lesson guide and student discussion questions.

The National Park Service's Teacher-Ranger-Teacher (TRT) program is an extended professional development opportunity for teachers at K-12 schools. TRTs spend the summer learning, and often living, in one of the National Parks. They perform various tasks, depending on their interests and the needs of the particular location, which includes developing lesson plans for their classrooms. 

The program aims to link National Parks and teachers from schools with underserved populations in urban and rural school districts. For more information visit www.teacherrangerteacher.org. Many application deadlines are January 31.