Which of the following is an indicator of economic development? A) High illiteracy
B) Unskilled labor force
C) Gross domestic product per capita
D) Under developed tertiary sectors

Air masses are characterized by various properties including temperature humidity air pressure and wind speed. which of the following air masses is associated with low relative humidity and high air temperature ?

According to the earth science reference tables, during which geologic time period were the continents of north america, south america, and africa closest together?

What are some of the impacts of humans on the earth?