Sketch a cross-section through a mid-ocean ridge, showing the layers of oceanic crust and a simple hydrothermal system while pointing out the location where the following minerals and rocks, (gypsum, pyrite, manganese mineral, barite, umber rock, greenschist, basalt pillow, and serpentinite ) had formed in the diagram.

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