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The world's surface air temperature is getting warmer. Whether the cause is human activity or natural changes in the Earth System—and the enormous body of evidence says it’s humans—thermometer readings all around the world have risen steadily since the beginning of the Industrial Revolution. 


Helping students build their understanding of Earth's spheres and how they are connected is difficult.  Review the graphics to help identify the parts of the Earth System and the processes that connect them at the local, regional, and global scales.




Ocean waters are constantly on the move; understanding how and why they move is not an easy task. However, it is an important job considering that these waters affect Earth’s climate, as well as habitats for plants and animals, even on land.