What is a primary cause of tides in coastal waters?

The primary cause of tides in coastal waters is the gravitational pull of the sun and the moon. This phenomenon occurs due to the gravitational forces exerted by these celestial bodies, which create bulges in the Earth's water bodies. As the Earth rotates, different areas move into and out of these bulges, resulting in the rise and fall of sea levels, which we experience as high and low tides.

The moon exerts a stronger influence on tides compared to the sun, as it is much closer to the Earth. The sun, while it has a significant gravitational force, has a lesser effect on tides due to its distance. The combined gravitational effects of both the moon and sun lead to the regular and predictable patterns of tides that can vary depending on the alignment and position of these celestial bodies in relation to the Earth.

Understanding this gravitational relationship is crucial for navigating and fishing in coastal areas, as tides can greatly affect water depth and currents, and consequently, the safety and efficiency of boating activities.