By continuing to drill sideways after a vertical well had reached its geological target, it was possible to reach far more rock surface area. (news.nationalgeographic.com)
Professor Taçon said that, «As with the early art of Europe, the oldest Southeast Asian images often incorporated or were placed in relation to natural features of rock surfaces. (sciencedaily.com)
He said: «Limpets need high strength teeth to rasp over rock surfaces and remove algae for feeding when the tide is in. (sciencedaily.com)