Mahayana Buddhists sometimes criticize Theravada Buddhists for being too focused on their own salvation. Why do they think this is the case? Conversely, Theravadans criticize Mahayanans for holding beliefs that contradict the original teachings of the Buddha. What's the basis for this critique? In your view, are either or both of these accusations legitimate?

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.