Platetectonics Part 2 Seafloor spreading & Slab Pull Rige Push скачать в хорошем качестве

Platetectonics Part 2 Seafloor spreading & Slab Pull Rige Push

This video, “Plate Tectonics – Part 2: Seafloor Spreading, Slab Pull & Ridge Push,” explains the modern mechanisms that drive the movement of tectonic plates and completes the theory introduced in part 1. The video begins with seafloor spreading, describing how new oceanic crust is formed at mid-ocean ridges. Magma rises from the mantle, cools, and solidifies, pushing older crust away from the ridge. This process explains why the ocean floor gets progressively older farther from mid-ocean ridges and provides strong evidence that tectonic plates are constantly moving. Next, the video introduces ridge push. Because mid-ocean ridges are elevated compared to surrounding seafloor, gravity causes the newly formed, higher crust to slide away from the ridge. This gravitational force contributes to plate motion but is not the main driving force. The video then focuses on slab pull, which is presented as the most important mechanism. At subduction zones, cold and dense oceanic plates sink into the mantle. As the plate descends, it pulls the rest of the plate along behind it, driving large-scale plate movement. Finally, the video explains how these processes together—seafloor spreading, ridge push, and especially slab pull—form a complete and evidence-based explanation for plate tectonics, replacing earlier ideas that relied mainly on mantle convection alone.