Serra da Cangalha crater, satellite image. North is at top. This impact crater (upper left) is located in north-eastern Brazil. The crater, which was formed some 220 million years ago following a meteorite impact, is 13 kilometres across, with a central elevated crater (2 kilometres across). The colours indicate varying types of vegetation (green), as well as bare ground (purple). Fields are at lower right. The non-cultivated land is mostly a land type known as cerrado (a mixture of savanna and riverside forests). This image, around 40 kilometres across, was obtained by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) on NASA's Terra satellite, on 23 June 2006.