Which of the following is a direct source of material for the formation of metamorphic rock? (A) clasts (B) magma (C) sediments (D)existing rock

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a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.

i'm sure the answer you are looking for would be

a. an ice age

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