To determine which statements about the Fall Line are true, let's analyze each option individually:
A) It marks the northern edge of the Piedmont.
To verify this statement, we need to understand what the Piedmont is. The Piedmont is a region located between the Atlantic Coastal Plain and the Appalachian Mountains. If the Fall Line marks the northern edge of the Piedmont, it implies that it separates the Piedmont from another region. However, the given statement does not provide any information about the separation, so we cannot confirm if it is true or false.
B) It is the last natural barrier for rivers on their way to the Atlantic.
To determine the accuracy of this statement, we need to understand the concept of the Fall Line. The Fall Line is an imaginary line that marks the boundary between the Atlantic Coastal Plain and the Piedmont region. Additionally, it represents the point where rivers encounter waterfalls or rapids as they flow from the Piedmont to the Coastal Plain. Therefore, rivers beyond the Fall Line become navigable, and the Fall Line can be considered the last natural barrier for rivers on their way to the Atlantic. Thus, statement B is true.
C) Many cities have developed along it.
To evaluate this statement, we need to consider historical development patterns. Due to the presence of waterfalls and rapids, the Fall Line has historically provided a source of energy and transportation, making it an attractive location for development. As a result, many cities, such as Philadelphia, Baltimore, and Richmond, have emerged along the Fall Line. Thus, statement C is true.
D) It contains large numbers of marshes and swamps.
To verify this statement, we need to assess the characteristics of the Fall Line. The Fall Line primarily consists of areas with waterfalls and rapids, created by the change in elevation at the transition between the Piedmont and the Coastal Plain. While it is possible for marshes and swamps to exist in certain sections along the Fall Line, it is not a defining characteristic. Therefore, statement D cannot be confirmed as true or false based on the information provided.
Therefore, the true statements about the Fall Line are B) It is the last natural barrier for rivers on their way to the Atlantic and C) Many cities have developed along it.