Answers

2016-01-25T19:30:40+08:00
Since it is night.....the sun is not present and the air is cooler, altho the middle of the rock is pressurized, making it harder to cool down :)

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2016-01-27T21:18:36+08:00
Sun is not present at night that means it is not hot that allows the outer part of the rock to cool down however since rock is a hard thing that means it's inner portion is not easily to be cool down.
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