The shape of the feet, along with the length and configuration of the toes, show that the Laetoli Footprints were made by an early human, and the only known early human in the region at that time was A. afarensis..6 million years ago in Laetoli, Tanzania, two early humans walked through wet volcanic ash. When the nearby volcano erupted again, subsequent layers of ash covered and preserved the oldest known footprints of early humans.
Control zone. A control zone (CTR or controlled traffic region) in aviation is a volume of controlled airspace, normally around an airport, which extends from the surface to a specified upper limit, established to protect air traffic operating to and from that airport.
buffer zone. (1) A transitional area between two areas of different zoning or characteristic land use. (2) Green space or other open or natural areas providing privacy and noise pollution control for a subdivision.n political science, an area between two antagonists that is put in place so they do not attack each other. A famous example of a buffer zone is the demilitarized zone separating North and South Korea. Occasionally, the buffer zone is a third country.