Answer to Question 1
Global glaciation can make sea level lower. There is less water in the ocean because it freezes into the glaciers.
Warm periods can cause glaciers and ice caps to melt. This raises the level of the ocean. Outgassing can also contribute to the heighten sea level.
High rates of seafloor spreading can create large oceanic ridges. The expansion displaces the water so the sea level gets higher. This also decreases the potential volume of the ocean.
Temperature can vary the amount of volume the water occupies.
Uplift and atmospheric events that send water in motion can create local changes in sea level. This includes wind and currents, seiches, storm surges and even El Nio and La Nia events.
Answer to Question 2
Sea breezes and land breezes are small, daily mini-monsoons. Morning sunlight falls on land and adjacent sea, warming both equally, but the temperature of the water does not rise as much as the temperature of the land. The warmer inland rocks transfer heat to the air, which expands and rises, creating a zone of low atmospheric pressure over the land. Cooler air from over the sea then moves toward land; this is the sea breeze. The situation reverses after sunset, with land losing heat to space and falling rapidly in temperature. After a while, the air over the still-warm ocean will be warmer than the air over the cooling land. This air will then rise, and the breeze direction will reverse, becoming a land breeze.
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