Question

4b based on evidence from the map, which statement identifies the pattern of the ages of crustal rocks in north america? (1) the oldest rocks in north america are found along the gulf of mexico, and the youngest rocks are found along the hudson bay. (2) the central region of the continent contains the oldest rocks, while the youngest rocks are found along the atlantic and pacific coasts. (3) the oldest rocks are found in the appalachian and rocky mountains. (4) rocks of the same age are found along the entire coastline of north america.

Explanation:

• Analyze each option:
• Option (1): The map shows that the rocks along the Gulf of Mexico are not the oldest and those along Hudson Bay are not the youngest.
• Option (2): The central region has higher age values (older rocks), and the Atlantic and Pacific Coasts have lower age values (younger rocks) as per the map.
• Option (3): The Appalachian and Rocky Mountains do not have the oldest rocks according to the map.
• Option (4): The coastline does not have rocks of the same age as shown in the map.

Answer:

(2) The central region of the continent contains the oldest rocks, while the youngest rocks are found along the Atlantic and Pacific Coasts.