Then and now: Images of our changing planet — mashable.com

From building goliath dams that harness great rivers, to the natural construction of new land by volcanic activity, our planet is in a state of continuous change. NASA spacecraft provide a unique vantage point for understanding the sweeping transformations, be they naturally caused or manmade. These comparative photographs span time periods from just days to several decades. Earth is ever changing, both naturally, and due to our actions. Slide the reveal bars below to see just how massive those changes can be.

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