Answer:
A flood is when a bunch of water comes rushing into a place and everything is almost completely covered in water. A landslide is much the same except it is with land-not water.
Explanation:
There is really nothing to know. All you have to use is context clues and common sense. We know some synonyms for direct are manage and handle. Indirect means not direct, right? And we can't handle or manage earth's interior (core), right? Therefore, the study of earth's interior is an example of indirect observation because we cannot directly manage it.
The ocean floor spreading showed that it is possible for landmasses to move.
Hope this helps, if not then I’m sorry