Here's a breakdown of how hotspots work:
* Deep Mantle Plumes: Hotspots are thought to be caused by plumes of abnormally hot rock rising from deep within the Earth's mantle. These plumes are like giant, slow-moving "blobs" of molten rock.
* Melting Point: As the plume ascends, it encounters lower pressure and begins to melt. This is because the melting point of rock decreases with decreasing pressure.
* Magma Generation: This melting process creates a pool of magma beneath the Earth's crust.
* Volcanic Eruptions: The magma eventually finds its way to the surface, causing volcanic eruptions.
So, it's not about a hotspot "beginning" to produce magma. It's a continuous process where the rising plume constantly melts, generating magma that eventually erupts as volcanoes.
