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Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536

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BuyFindarrow_forward

Fundamentals of Physical Geography

2nd Edition
James Petersen
ISBN: 9781133606536
Textbook Problem

Identify the two major factors that cause regular variation in insolation throughout the year. How do they combine to cause the seasons?

To determine

The two major factors that cause regular variation in insolation throughout the year and the way in which they combine to cause the seasons.

Explanation

The variations in the intensity and amount of insolation brings about changes in seasonal temperature received at different places on the Earth. Insolation may not be uniform everywhere on the Earth due to several reasons. However, the Earth’s rotation on its axis and its revolution around the sun (which imply the duration of daylight hours and the sun’s angle at the surface) are the principal factors affecting insolation.

The duration of solar radiation is regulated and controlled by the length of daylight and the intensity of solar radiation received is controlled by the angle of the sun’s rays. These two factors are the principal ones affecting the solar radiations received at a given location on the surface of the Earth.

Hence, if the solar rays strike a location at a steep angle or if the sun shines for a longer period, the location would receive more insolation. Since the Earth presents a spherical surface to insolation, the intensity of solar radiation reaching at a given time differs from place to place...

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