What is the layer that is part crust part mantle?

Explain the value of statistics and other data to positive economics and to normative economics

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

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