Question

The Sun is v kilometers from the upper edge of the Earth's atmosphere and q kilometers from the surface of the Earth.

Which of the following expressions always represents the distance between the Earth’s surface and the upper edge of the Earth's atmosphere?

Answer 1

q - v

Explanation:

v = distance between Sun and atmosphere

q = distance between Sun and surface of Earth

So the distance between the atmosphere and the surface of the earth is the difference between them. Since q > v:

d = q - v