Why does black powder not explode unless it is ignited in a confined area?

The model of human settlement suggests that uthe model of human settlement suggests that urban growth is patterned around transportation networks such as railroads and highways. a. burgess b. hoyt c. sauer d. von thunenrban growth is patterned around transportation networks

On the map below, which of the following rivers is identified by blue? the huang he river the yangtze river the han river the naktong river

Much of the region of central africa is forest and savanna. select the best answer from the choices provided t f