Most oceans on the earth's surface. Extensive research on the ocean floor is possible only with more sophisticated instruments than now. Therefore, scientists must know less about the ocean floor environment than other environments on the planet. If correct, the one that best supports the above conclusions is:. ['Many mountains are completely below sea level, yet the 3D images produced by the new underwater detection equipment are as accurate as the 3D images of mountains on the ground.', 'Strong currents circulate on the ocean floor, but the overall shape of their movements is not as easy to understand as the shape of air currents moving on land.', 'Contrary to most terrestrial environments, temperature conditions at sea level are generally stable and consistent because sunlight cannot penetrate below extremely deep sea levels.', 'Very few people have seen detailed maps of the extended sea floor, even though such maps can be seen in almost all large libraries.']