1) The seasons are caused by variations in the intensity and duration of solar radiation received at different latitudes throughout the year. The tilt of the Earth's axis of rotation relative to its orbit around the sun causes the seasons. 2) During the winter solstice in the Northern Hemisphere, days get shorter the farther north you travel. 3) The angle of the noon sun and the intensity of solar radiation received at the outer edge of the atmosphere are directly related, with higher sun angles resulting in greater intensities.

1. 1. In Activity 13.1, Question 7, what did you determine 6. What causes the intensity and
duration of solar was the percentage of solar radiation that is interradiation received at any place
to vary throughout cepted by each of the following 30 segments of the year? That is, what causes
the seasons? latitude? 030N latitude: %3060N latitude: %6090N latitude: 96 7. What are the
maximum and minimum noon Sun 2. How many hours of daylight occur at the following angles
at your latitude, and what are the dates when locations on the specified dates? (Hint: See Table
13.1.) they occur? LATITUDE40N090SMARCH22hrhrhrDECEMBER22hrhrhr Maximum noon
Sun angle: __ on Minimum noon Sun angle: __ on 8. What are the approximate maximum and
minimum durations of daylight at your latitude? hr 3. During the winter solstice in the Northern
Hemisphere, Maximum duration of daylight: bas do the days get longer or shorter the farther
north you travel? 4. What is the relationship between the angle of the noon Sun and the intensity
of solar radiation received at the outer edge of the atmosphere? 5. Complete Figure 13.e,
showing Earth's relationship to the Sun on June 22. Sketch and label the following on Earth:
Axis Equator Tropic of Cancer Tropic of Capricorn Antarctic Circle Arctic Circle Circle of
illumination