Final answer:
High and low tides do cause a reversing waterfall effect in Cobscook Bay, Maine.
Step-by-step explanation:
True. High and low tides do cause a reversing waterfall effect in Cobscook Bay, Maine. This phenomenon is observed due to the gravitational pull of the Moon on different parts of Earth's oceans. As Earth rotates, it carries an observer through two tidal bulges, resulting in two high tides and two low tides. During high tide, the water level rises and creates a waterfall effect as it rushes back into the lower areas during low tide.