What causes windy conditions at the coast in the summer?

the ocean

Explanation:

because well the ocean despite how many trees we have make the mejorety of the air we breath even right now that is why the coast is so windy in the summer

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.