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.
The definition of a Green Zone varies from community to community, but there is a common concept: a Green Zone designation provides a local framework to protect the environmental and economic health of a community heavily affected by local pollution. Read more about Green Zones in this LA Times article.he Environmental Protection Agency endorsed the Green Zone concept at a forum at the White House in December 2010. CBE was there, along with other environmental justice and indigenous groups from around the country.