Lesson 2.1.1

Earth, which is the third planet from the sun, revolved around the sun at a speed of about 67,000 miles per hour

It takes one year for Earth to make one revolution

At the same time, Earth rotates on its axis - an imaginary line that runs from the North Pole to the South Pole through the center

Each rotation takes almost one day

Earth tilts at an angle of about 23.5 degrees on its axis

Because of this tilt, the Northern Hemisphere receives more direct sunlight for half the year, and temperatures are warmer

During these months, the Southern Hemisphere receives less direct sunlight, and temperatures are cooler

The second half of the year, is the exact opposite

This process creates the four seasons