Sediments composed of particles of one size are called ___________. I think it's well-sorted but am not sure.

You are correct.

See:
http://72.14.253.104/search?q=cache:BtQzENSvQ4MJ:flightline.highline.edu/wmoses/Ocean101/OC101PowerPoints/Sediments.ppt+Sediments+%22particles+of+one+size%22+sorted&hl=en&gl=us&ct=clnk&cd=7

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ug how does this help????????