It doesn't actually. The moon will cause high tide in one part of the world while half way around there is low tide at the same time.
No it is not the sea level definitely depends on where you are located like in Florida is considered below sea level and in Colorado they are above sea level
Sea level (average sea level) is the start point for measuring elevation on this planet and is considered to be the same everywhere. Chicago, however, is not at sea level; rather its mean elevation is 586 feet (179 meters) above sea level.
Mean sea level is the same everywhere. Tidal variations are different in different places. You would need local info for this. The local coastguards could give you this.
G i.e force per unit mass on the earth surface......YES.because all calculation is approximately 10
No, altitude and sea level are not the same thing. Altitude is the distance of a location above sea level, while sea level is a specific level used as a reference point for measuring elevations. Sea level represents the average level of the ocean's surface.
The same that it always is.. sea level
Winds blow sand on the island, which make dunes and keep it above sea level.
No
At sea level everywhere on the Earth oxygen makes up about 20% of the atmosphere.
Points that are located at the same elevation above sea level are said to be at the same altitude. points A, B, and C are at the same altitude.
No, sea-level pressure and station pressure are not the same. Station pressure is the atmospheric pressure measured at a specific location, while sea-level pressure is the station pressure adjusted to sea level using a standard formula to account for differences in elevation.
The density of the lead weight will remain the same regardless of the change in altitude. Density is a property of the material itself and does not change with elevation.