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National Park Service
It Was a Very Good Year
Waterton-Glacier International Peace Park includes whitebark pines that are over 1,200 years old, meaning they have been there since before medieval times. The second lesson of five details how to read tree rings for climate change and...
National Earth Science Teachers Association
Windows to the Universe: Earth's Oceans
Windows to the Universe provides a general overview of the importance of the oceans and seas to the Earth. Content includes information on how the oceans impact Earth's weather and contribute to the water cycle.