Answer:
The compass always points north. One can use this to know which direction North is, and therefore, in which direction south is, since south is directly opposite of north.
A because that’s the only one that makes logically sense
Gas density creating our atmosphere
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Explanation: At latitude 0° (the Equator) day length will be approximately 12 hours. Areas on the Equator have a constant 12 hours of daylight all year round. As latitude increases to 80° (polar circles - north or south), day length can be seen to increase to 24 hours or decrease to zero (depending on the time of year).