Geographers use two key questions every day. When using these two key questions to study the migration of birds, a geographer would ask "where are the birds going?" and "?"

a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container.

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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.