High tide are experienced 12 hours apart for a certain coastline. which of the following best explains the reason for this phenomenon? the coastline experiences tidal bulge twice a day. the coastline experiences tidal bulge once a day. the coastline comes in a straight line with the moon once. the coastline becomes 90 degress with the moon twice.

The answer is The coastline experiences tidal bulge twice a day. This occurs due to the rotation of the earth. When the sun is either on the same side as the moon or opposite side of the moon relative to the earth (which happens twice a day), then the coastline will experience high tide on these two occasions. Tides are caused by gravitational effect on water masses on the earth that cause them to bulge towards the direction of the two celestial bodies.