What was Pennsylvania's leading industry in the early 1950s according to William F. Schultz, Jr.?

• Steel production

• Agriculture

• Textile manufacturing

• Automobile manufacturing

What environmental issue had caused more than five million acres of farmland to be lost in Pennsylvania by the early 1950s?

• Erosion of topsoil

• Deforestation

• Urban development

• Industrial pollution

Which of the following rivers is NOT mentioned as part of Pennsylvania's drainage systems?

• Mississippi River

• Allegheny River

• Delaware River

• Susquehanna River

What was a major consequence of the nineteenth-century exploitation of Pennsylvania's natural resources?

• Polluted waterways and denuded landscapes

• Increased agricultural production

• Expansion of urban areas

• Development of new transportation systems

Which insect is mentioned as a threat to Pennsylvania's forests in the twentieth century?

• Gypsy moths

• Locusts

• Termites

• Beetles