The summer and winter seasons in a year are caused by

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Q: 99 (NDA-I/2014)
The summer and winter seasons in a year are caused by
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question_subject: 

Geography

question_exam: 

NDA-I

stats: 

0,91,41,21,18,2,91

keywords: 

{'winter seasons': [0, 0, 0, 1], 'summer': [1, 0, 0, 0], 'annual revolution': [0, 0, 0, 1], 'solar insolation': [0, 0, 0, 1], 'perihelion': [3, 0, 0, 0], 'sun': [3, 0, 0, 6], 'aphelion': [3, 0, 1, 2], 'year': [27, 4, 33, 49], 'rotation': [1, 0, 0, 2], 'earth': [0, 1, 1, 1], 'axis': [0, 0, 0, 1]}