Portal:Earth sciences/DYK/5

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 * ... that plate reconstructions (example pictured) that use magnetic stripe patterns can only go back to the Jurassic period, as there is no older oceanic crust?
 * ...that during hot greenhouse periods in Earth's history, the tropics appeared to be cooler than they are today?
 * ...that the 2002 Sumatra earthquake is considered to be a foreshock of the 2004 Indian Ocean earthquake?
 * ...that the geology of the Grand Canyon area includes more than 40 identified rock layers?
 * ...that Bristol Diamonds were popular souvenirs for visitors to the spa at Hotwells, Bristol in the eighteenth and nineteenth centuries?
 * ...that hoodoos are tall skinny spires of rock that protrude from the bottom of arid basins and badlands?