How do oceanic ridges support the theory of plate tectonics?

Oceanic ridges are central to the theory of plate tectonics because they serve as the primary sites of seafloor spreading, where new oceanic crust is continuously generated.12

These ridges provide critical evidence for the theory in several ways:

• Crustal Generation: At these divergent margins, magma rises from the mantle to fill fractures created as plates pull apart. This material cools to form new crust, effectively pushing the existing seafloor away from the ridge crest in opposite directions.12
• Age Distribution: Data collected from the ocean floor demonstrate that the age of the crust increases with distance from the spreading centre. This pattern confirms that the seafloor is actively spreading outward from these ridges.1
• Topographic Feedback: The ridges are elevated 2 to 3 km above the surrounding seafloor because the crust there is swollen with heat. This elevation creates a gravitational force that helps push the plates apart, sustaining the process of divergence.1
• Geological Activity: The presence of frequent shallow earthquakes, high heat flow, and active volcanism at ridge crests provides direct, observable evidence of the extensional forces driving plate movement.13