Which former slave became a conductor on the Underground Railroad and was known as the "Black Moses"?

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

Why slip off slopes are found on the inside of meanders? why river cliffs are found on the outside of meanders?

How have ethnic groups shaped the population in central america and the caribbean? how has migration shaped the population in central america and the caribbean? how has small land areas shaped population in central america and the caribbean? how has a rapid population growth shaped the population in central america and the caribbean?