Portal:Earth sciences/DYK/5

... 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?