When magma solidifies it forms rocks. if a pre-existing rock is exposed to extreme heat or pressure its physical properties can change, forming a(n) rock. rocks derived from the weathered grans of other pre-existing rocks through lithification are rocks.

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.

c. 2,000 bce

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answer conditional instability;