They are developed countries because the people there are healthy and educated.
Answer:
Option (A)
Explanation:
The horizon is usually defined as the place where both the sky and ground meets. If the height of the observer is higher, then the horizon becomes more lower and distance increases from the observer to the visible horizon.
The line of horizon is often concealed by the presence of trees, buildings and houses, mountains and land areas.
There are mainly two types of horizon namely, the true horizon and the visible horizon.
Thus, the correct answer is option (A).
Answer:
It is thicker below mountains than in valleys.
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