Magenta - The magenta areas had more, bigger, or healthier plants and trees in 1984 than in 1993.

Green - This is the opposite of magenta. Green areas areas had more or bigger plants and trees in 1993 than in 1984. This shows up a lot in farming areas, where the crops are bigger, or the farmer has a different kind of plant growing in his/her field in 1993 than in 1984.

Blue - Blue areas show where the city grew between 1984 and 1993. People built new houses, stores, factories, and other kinds of buildings. If you look closely in some areas, you can see the new building as a blue rectangle!

White - These are areas where the Earth's surface is a lot brighter in 1993 than in 1984. For instance, the clouds in the 1993 satellite image show up white in the change image. Another thing that can cause areas of the change image to be white is ground which was burned in 1984 (so is very dark), but was recovering (growing new plants) by 1993.

Black - This is the opposite of white. For example, areas that look black were burnt in 1993, or were new farmland that were natural areas (like fields and forests) in 1984. When farmers make new farmland, they dig up the dirt and turn it over. Dirt can be dark compared to plants, depending what color you are looking at.