K-12 students from all over the world are participating in the GLOBE program by taking environmental measurements at their schools and sharing their data via the Internet. NASA scientists use GLOBE data in their research and provide feedback to the students. As students conduct the full range of GLOBE measurements, they should gain a perception that the environment is the result of an interplay among many processes that take place locally, regionally, and globally on time scales ranging from seconds to centuries. The learning activities in the Earth System Science chapter of the GLOBE Teachers' Guide help students learn this lesson by studying annual variations in environmental parameters (the seasons and phenology) and by examining the connections among the various phenomena measured in GLOBE on local, regional, and global spatial scales. Student measurements covered in this chapter include: budburst, green-up, green-down, ruby-throated hummingbird, phenological gardens, lilac phenology, arctic bird migration, and seaweed reproductive phenology . Two learning activities are presented: Seasons and Phenology and Exploring the Connections.
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