while hiking in the grand canyon of northern arizona, you stop and observe an outcrop that exposes three different sedimentary rock types. on the bottom is a layer of shale, which is overlain by a layer of limestone, which is in turn overlain by a layer of sandstone. this stratigraphic sequence indicates a or a in sea-level occurred in this location in the past.

The map above shows the countries of the middle east. which number on the map shows the location of iraq? a. 1 b. 2 c. 3 d. 4

Which barrier to economic development is shown in the following examples? i. the high rate of hiv infection in underdeveloped nations ii. the use of children as soldiers in uganda’s army in the early 2000s iii. low literacy rates in underdeveloped nations with limited exposure to adequate education a. foreign debt b. political instability c. widespread disease d. low levels of social welfare

What geologic process is related to caldera formation?