SDI Open Water Scuba Diver Practice Exam

Which of the following statements about currents is true?

1. Currents only affect surface water

2. Currents can be both permanent and temporary

3. Currents are caused solely by wind

4. Currents do not affect diving

The correct answer is: Currents can be both permanent and temporary

The statement that currents can be both permanent and temporary is accurate because ocean currents are influenced by a variety of factors and can take different forms. Permanent currents, like the Gulf Stream, flow continuously and consistently due to factors such as temperature differences and the Earth's rotation. On the other hand, temporary currents, also known as tidal currents, can occur due to the gravitational pull of the moon and sun, resulting in variations that change with the tides. Understanding the nature of both permanent and temporary currents is crucial for divers as it helps them anticipate water movement, identify potential hazards, and make informed decisions about dive planning and safety. The existence of both types of currents emphasizes the dynamic nature of underwater environments, which can impact visibility and positions of marine life, hence affecting the overall diving experience.