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Seafloor spreading is one of the two major processes of plate tectonics, the other being subduction. Seafloor spreading is the continuous process of forming new igneous rock at midocean ridges by injection of magma that forms new seafloor.
In this video an introduction to seafloor spreading, subduction and megathrust earthquakes are animated to allow for easier understanding of the topics.
28 Απρ 2020 · This science lesson plan aims to teach 10th grade students about seafloor spreading through various classroom activities. Students will learn how seafloor spreading happens, how drill samples provided evidence of spreading, and the lines of evidence that support plate tectonics theory.
26 Απρ 2024 · The theory of plate tectonics states that Earth’s solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.
29 Μαρ 2004 · Rocks on the seafloor on either side of a mid-ocean spreading ridge preserve a record of the Earth's magnetic field over time. The discovery of this phenomenon was an important bit of evidence that helped confirm the theory of plate tectonics. The interactive animation below illustrates this concept.
Rift valleys provide insight into the processes of seafloor spreading, the characteristics of plate boundaries, and the mechanisms driving plate motion, as they exemplify how tectonic activity shapes the Earth's surface.
This animation of seafloor spreading and plate tectonic evolution of the planet since 200 million years ago is created from a synthesis of marine geophysical data (namely, the magnetic anomalies) and geological data on the continents.
