How is it not possible to see all continents on the globe?

It is not possible to see all continents on the globe from any one vantage point due to the curvature of the Earth. As you move away from any one continent, the curvature of the Earth obstructs your view of the continents on the opposite side. Additionally, atmospheric conditions, such as haze and cloud cover, can further limit visibility of distant continents. To see all continents on the globe, one would need to view the Earth from outer space.