2. Are the Earth's seasons caused by the differences in the distance from the Sun throughout the year or the tilt of the Earth's axis? _____________________________________________________________

3. What is the tilt of the Earth's axis (in degrees)? __________________________________

4. During which season do the Sun's rays hit the Earth at the most direct angle? __________________________________

5. During which season are the days the shortest? __________________________________

6. What is the name of the shortest day of the year (and the beginning of winter)? __________________________________

7. What is the name of the longest day of the year (and the beginning of summer)? __________________________________

8. What is the name of a day in which the day and night are of equal duration? __________________________________

9. How many times each year do we have days in which the day and night are of equal duration? ___________________________