has been subsiding
Present perfect progressive he/she conjugation of subside.

subside

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And we can check that, because Holland is a subsiding area; it has been subsiding for many millions of years; and Sweden, after the last Ice Age, was uplifted.
Y podemos comprobar eso, porque Holanda es un área en hundimiento; se ha estado hundiendo durante varios millones de años; y Suecia, después de la última Edad de Hielo, se elevó.
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