why AmEriCAn sCiEntists ArE DEvEloping thEsE mAps
A．to EstimAtE thE ExtrEmE wEAthEr.
B．to DEvElop thE sAtEllitE tEChnology.
C．to improvE AgriCulturAl output.
D．to lEArn how to ChAngE inFormAtion to mAps morE EFFiCiEntly.