Here are some milestones in the development of technology used by geographers Put them in order in which they appear in history
Compass
Scale maps
Aerial photography
Astrolabe

7. according to the theory of isostasy, which statement must be true? a. the asthenosphere is denser than the lithosphere. b. the asthenosphere has the same density as the lithosphere. c. the lithosphere has the same density as the core. d. the lithosphere is denser than the asthenosphere.

In which area will soil formation be greatest? a a steep slope in a warm,b wet climate a flat area in a warm,c wet climate a north-facing area on a steep slope a flat area in a cold, d wet climate description

The layers of earth are based on what two sets of characteristics?