MCQ Detailed View

The Earth moves in space in two important ways: rotation and revolution. Rotation means the Earth spins on its axis once every 24 hours, which causes day and night. Revolution means the Earth orbits around the Sun once every year, and this movement is responsible for bringing the seasons.

The Earth completes one revolution in about 365 days and 6 hours, which is the length of a year. During this time, the Earth’s axis stays tilted at an angle of about 23.5 degrees. This tilt is very important, because it causes different parts of the Earth to receive different amounts of sunlight at different times of the year.

When the Northern Hemisphere is tilted toward the Sun, it gets more direct sunlight and longer days, leading to summer, while the Southern Hemisphere has shorter days and less sunlight, leading to winter. Six months later, the situation is reversed, bringing summer to the south and winter to the north. The in-between times are spring and autumn.

This pattern explains why we have four distinct seasons:

• 
  

  Spring – mild temperatures and growing daylight.

  
  


• 
  

  Summer – hottest period with longest days.

  
  


• 
  

  Autumn (Fall) – cooler weather and shorter days.

  
  


• 
  

  Winter – coldest season with shortest days.

  
  

Other natural events like tornadoes, rainfall, and earthquakes do not result from the Earth’s revolution. Tornadoes are caused by wind systems, rainfall is part of the water cycle, and earthquakes occur due to tectonic plate movements.

Therefore, the correct answer is that the Earth’s revolution around the Sun causes the seasons.