Australia moves millimeters in tune with the seasons
What makes continents move? Geologists have long sought answers within Earth's mantle. The concept is simple: tectonic plates rest on top of the asthenosphere in Earth's upper mantle. The asthenosphere is like a conveyor belt with convection currents of molten rock that shift the tectonic plates as the mantle flows and shifts. But Australia moves at a surprisingly fast rate — it's shifted 4.9 feet since 1994. Not only does the continent shift over time, but it also wiggles back and forth in the ocean. And a new study suggests that the seasons may be to blame.
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