Basalt Rock (IMAGE) University of Victoria Caption Over 90 per cent of the Earth’s basalt rock is located on the deep ocean floor, such as this pillow lava bed seen at Endeavour (depth, 2,195 metres). Credit Ocean Networks Canada/CSSF-ROPOS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.