As shown from calculation,the change of the earth's surface area and the crust's volume caused by the moon's maximum declination is 2.3 times as big as that caused by its minimum. This can well account for the gas release from the earth when the declination is at its maximum and for the corresponding droughts in China when at its minimum.This mechanism is also confirmed by both the periodical variation of the earth's rotation and the periodical occurrence of earthquakes.
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杨学祥,陈殿友,李守春.干旱、地震与月球赤纬角变化[J].地震工程学报,1999,21(1):44-47. YANG Xue-xiang, CHEN Dian-you, LI Shou-chun. DROUGHT, EARTHQUAKE AND THE VARIATION OF THE MOON'S DECLINATION[J]. China Earthquake Engineering Journal,1999,21(1):44-47.