Question 21
The Earth and Solar SystemThe movement of the earth that causes variation in the lengths of the day and night is
- A.traction
- B.revolution
- C.rotation
- D.coriolis
Show the answer and explanation
Answer: B (revolution)
Explanation
As the tilted earth revolves round the sun, each hemisphere leans towards or away from the sun, so the lengths of day and night change through the year. Rotation alone causes day and night, not their variation.