An underground layer of rock sand or other material through which groundwater flows

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

India's population is made up of percent hindus.

Why are young eastern european democracies at an increased risk for turmoil during a global recession? a) anger against increased democracy b) failure of the free market system c) government corruption d) lack of from the e.u.