Question

fill in the blank question
abyssal clay is often called red clay because these pelagic sediments are rich in the element
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Explanation:

Abyssal clay (red clay) gets its red color due to the presence of iron (specifically iron oxides/hydroxides). The iron content in these pelagic sediments imparts the reddish hue, so the element rich in abyssal clay that causes it to be called red clay is iron.

Answer:

iron