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  • Oceanic vs. Continental Crust: Why is Oceanic Crust Denser?
    The main reason oceanic crust is heavier than continental crust is due to composition.

    Here's a breakdown:

    * Oceanic Crust: Primarily composed of basalt and gabbro, which are dense, mafic rocks rich in iron and magnesium.

    * Continental Crust: Predominantly made up of granite and other felsic rocks, which are lighter and have higher concentrations of silica and aluminum.

    Density:

    * Mafic rocks (basalt and gabbro): Have higher density than felsic rocks (granite). This means they contain more mass packed into a smaller volume.

    * Felsic rocks (granite): Have lower density due to their higher silica content.

    Therefore, the denser composition of oceanic crust makes it heavier than continental crust. This difference in density is a crucial factor in plate tectonics, as it contributes to the subduction of oceanic crust beneath continental crust at convergent plate boundaries.

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