When cool, dense air from over the water flows inland, it's called a a. land breeze c. jet stream b. polar easterly d. sea breeze

The answer to your question is D. Sea Breeze. Sea breeze is a cool dense air which blows form the sea to the coast it's air which is warmed by the Sun's rays. land breeze is breeze has a reverse direction it blows from coast to sea. Jet streams are fast flowing air currents found in atmosphere of some planets. In Earth's Atmosphere it is found in tropopause which is a boundary between trophosphere and stratosphere. Polar easterly is a dry cold wind which from the high-pressure areas of the polar highs at the North and South Poles towards low-pressure areas within the Westerlies at high latitudes.

No because the eaeht is on a 23.5 degree axis tilt and so when it is winter the northern hemisphere is pointing away from the sun and the soutubern hemisphere is pointing toward the sun