Which zone extends from low tide to the continental edge at about 200 meters?

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Multiple Choice

Which zone extends from low tide to the continental edge at about 200 meters?

Explanation:
The concept here is how coastal zones are defined by tide exposure and depth. The Subtidal Zone begins at the low tide line and extends offshore to the edge of the continental shelf, roughly around 200 meters deep, staying underwater at all times. This makes it distinct from the Intertidal Zone, which is between high and low tides and periodically exposed, and from the Splash Zone, which sits above the high-tide line and is only wetted by waves, as well as from the Aphotic Zone, which is the deep, permanently dark region beyond the reach of light.

The concept here is how coastal zones are defined by tide exposure and depth. The Subtidal Zone begins at the low tide line and extends offshore to the edge of the continental shelf, roughly around 200 meters deep, staying underwater at all times. This makes it distinct from the Intertidal Zone, which is between high and low tides and periodically exposed, and from the Splash Zone, which sits above the high-tide line and is only wetted by waves, as well as from the Aphotic Zone, which is the deep, permanently dark region beyond the reach of light.

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