Which term refers to a device used to collect sediment samples by clamshell action?

Which term refers to a device used to collect sediment samples by clamshell action?

• A. Grab Sampler
• B. Push Core
• C. Clamshell Sampler
• D. Box Core

Answer: (C)

The clamshell sampler is the device described. It uses two hinged jaws that open and then snap shut like a clamshell to scoop and trap sediment as the instrument is lowered and retrieved. This clamshell action specifically identifies the method as a discrete surface-sediment sampler. Push cores and box cores are designed to take undisturbed vertical columns: push cores drive a hollow tube into the sediment to preserve layering, while box cores collect a square, larger block of sediment. A grab sampler is a broader term for devices that grab sediment, but the description calling out clamshell action points to the clamshell sampler.

The clamshell sampler is the device described. It uses two hinged jaws that open and then snap shut like a clamshell to scoop and trap sediment as the instrument is lowered and retrieved. This clamshell action specifically identifies the method as a discrete surface-sediment sampler.

Push cores and box cores are designed to take undisturbed vertical columns: push cores drive a hollow tube into the sediment to preserve layering, while box cores collect a square, larger block of sediment. A grab sampler is a broader term for devices that grab sediment, but the description calling out clamshell action points to the clamshell sampler.