Tharp with an undersea map at her desk. Rolled sonar profiles of the ocean floor are on the shelf behind her.
Lamont-Doherty Earth Observatory and the estate of Marie Tharp
Born on July 30, 1920, geologist and cartographer Tharp changed scientific thinking about what lay at the bottom of the ocean – not a featureless flat, but rugged and varied terrain.
Lord Howe Island is one of the few places where the lost continent of Zealandia is exposed above sea level.
We undertook a 28-day voyage to explore a possible lost continent in a remote part of the Coral Sea, in an area off the coast of Queensland. Here's what we found.
Photographed on Kangaroo Island, this rock – called a ‘zebra schist’ – deformed from flat-lying marine sediments through being stressed by a continental collision over 500 million years ago.
Giant forces slowly move continents across a viscous layer of the Earth, like biscuits gliding over a warm toffee ocean. This stresses the continents, and twists and contorts the crust.
Scientists have predicted four supercontinent scenarios - but which is the most likely?
The continent of Australia is a mixture of land masses of differing ages.
The world's oldest known material is from Western Australia. But for much of Australia's geological past, the eastern states simply didn't exist. They're relative newcomers to our ancient continent.
Mauritius beachfront view with volcanic mountains. The basaltic lavas constituting these mountains formed no older than 9 million years ago.
Prof. Susan J. Webb, University of the Witwatersrand
Researchers have found a small piece of a "lost continent" buried underneath the lava on Mauritius.
Satellite image of California’s San Andreas fault, where two continental plates come together.
NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team
Fifty years on from a groundbreaking paper, geophysicists have progressed from believing continents never moved to thinking that every movement may leave a lasting memory on our planet.
How many continents can you count on one hand?
From the 1950s until recently, we thought we had a clear idea of how continents form. Most people will have heard of plate tectonics: moving pieces on the surface of the planet that collide, pull away…