General Structure and Writing Style. The function of a research design is to ensure that the evidence obtained enables you to effectively address the research problem logically and as unambiguously as possible.
ALLEGHENY RIVER HISTORY. Location: A river rising in north-central Pennsylvania and flowing about 523 km (325 mi) northwest into New York then southwest into Pennsylvania again, where it joins the Monongahela River at Pittsburgh to form the Ohio River.
Once a flat sea floor, millions of years of erosion have carved the surface of Allegheny County into a maze of ridges and valleys. Pittsburgh sits where the Monongahela River from the south, and the Allegheny River from the north, join to form the Ohio. Many named and unnamed tributaries steadily cut through layers of sedimentary rock: limestone, sandstone, shale, coal.