Answer:
5.) It can be observed that earthquake epicenters. active volcanoes and mountain ranges overlaps in the map.
From the observation, mountain ranges are forming because tectonic activities in these places are active. There are a lot of earthquakes and volcanoes in the are because this is where the oceanic and continental plates meet. Mountain ranges form as a result of these tectonic activities of the ground.
6.) I think the scientists basis in dividing the Earth's Lithosphere is the distribution of earthquake epicenters, location of active volcanoes and formation of Mountain ranges.
They were able to plot which are the boundaries of the plates by observing the volcanic activities of these areas.
The movement of these plates creates the mountain ranges, valleys, trenches and rifts deep in the ocean. We can observe in the map that the plates movement varies either they move towards each other (convergent plate boundaries), away from each other (divergent plate boundaries) and slide past each other (transform plate boundaries).
Explanation: