Question

Which is the most precise reason for decreasing temperature from equator to poles?

• A. Wind direction
• B. Distance from earth's center
• C. Angle of Sun's rays
• D. Ocean currents

Hint:

Vertical Sun Rays = More Heat.
Slanting Sun Rays = Less Heat.

Answer 1

The Correct Option is C

Concept: Temperature distribution on Earth depends mainly on the amount of solar energy received at different latitudes. The angle at which the Sun's rays strike the Earth's surface plays a crucial role in determining temperature.

Step 1: Understand solar radiation at the Equator. Near the Equator, the Sun's rays fall almost vertically. As a result:

• Energy is concentrated over a smaller area.

• Heating is more intense.

• Temperatures remain high throughout the year.

Step 2: Understand solar radiation near the poles. Towards the poles, the Sun's rays strike the Earth at a slanting angle. This causes:

• Energy to spread over a larger area.

• Less heating per unit area.

• Lower temperatures.

Step 3: Analyze the options. Wind direction and ocean currents influence regional temperatures but are not the primary global reason. Distance from the Earth's center is practically the same everywhere and has no significant effect. The angle of solar incidence is the fundamental reason.

Step 4: Conclusion. Therefore, temperature decreases from the Equator towards the poles mainly because of the changing angle of the Sun's rays. Hence, option (C) is correct.