28 years in just 5 seconds...
This +Google Earth
image shows the evolution over time of the Ucayali River in a nature reserve in Peru.
You can see this animated GIF on the Google Earth Engine, a project that compiles satellite images of the past 40 years.
The visual images are made available online to help scientists, students and people around the world.Take a look for yourself: http://goo.gl/Oq2UHk