It can be one of two things.
First, it can be due to global warming.
Second, it can be due to the rotation of the sun. When the sun rotates, it can change it latitude causing it to hit at different points onto different areas of the world.
The answer is most likely 4 but I think you need a table or a marked hygrometer to work this out. You can't really work out humidity by the given temperatures. All you can know for sure is that there is a strong chance of rain because dew point is only 1 degree away. (I think what they want you to do is 29/30 x100)
Answer: The halocline refers to the region below the mixed layer where the salinity changes as you move deeper underwater.
The largest country there is Saudi Arabia
1. <span>Sahel
2. </span><span>Kalahari
3. </span><span>Mount Kilimanjaro
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