Which major tectonic plate comprises the North American continent and the western Atlantic ocean floor?

The correct option is North American Plate.

Explanation

According to the Plate Tectonics Theory, the Earth's lithosphere is broken into distinct rigid slabs called tectonic plates. These plates move over the asthenosphere. A single major plate often consists of both continental lithosphere (landmass) and oceanic lithosphere (ocean floor).

Detailed Analysis:

• North American Plate: This is a major tectonic plate that includes the entire North American continent, Greenland, and parts of the Caribbean. Crucially, it also extends eastward into the Atlantic Ocean, covering the western Atlantic ocean floor up to the Mid-Atlantic Ridge.
• Eurasian Plate: This plate comprises Europe, most of Asia (excluding the Indian subcontinent, Arabian subcontinent, and eastern Siberia), and the eastern part of the North Atlantic Ocean floor.
• African Plate: This plate includes the continent of Africa and the eastern South Atlantic Ocean floor.
• Pacific Plate: This is the largest tectonic plate and is composed almost entirely of oceanic crust.

Key Takeaway:

Tectonic plates are not identical to continents; the North American Plate encompasses both the continental landmass and the adjacent western Atlantic Ocean floor up to the divergent boundary at the Mid-Atlantic Ridge.