Final answer:
New evidence and technologies caused scientists to develop and revise the theory of plate tectonics, including fossil evidence, rock dating methods, and SONAR.
Step-by-step explanation:
- Fossil evidence revealed that the same plants and land animals are on continents that are now separated by oceans.
- Rock dating methods showed that sea-floor rocks are generally younger than continental rocks.
- Sound projections called SONAR revealed that the ocean floor contains continuous chains of mountains, or ridges, and deep trenches.
- Maps showed that the outlines of continents and continental shelves match like puzzle pieces.
- Global positioning system satellites measured how points on Earth's surface move constantly at a slow rate.
Learn more about plate tectonics