What is the size of a single grain of quartz on the Phi scale?
A single grain of quartz measures 0.25 millimeters across and sits on the Phi scale between values of 3 and 4.
Questions about Sediment
Short answers, pulled from the story.
Who developed formulas to measure particle sphericity in the mid-20th century?
William C. Krumbein developed formulas in the mid-20th century to measure sphericity by comparing long, intermediate, and short axis lengths.
How old are sediments found beneath the South Pacific Gyre ocean floor?
The South Pacific Gyre holds sediments up to 101.5 million years old beneath 250 feet of ocean floor.
When did scientists report findings about microorganisms surviving in organically poor sediments?
Scientists reported these findings in July 2020 after drilling 250 feet below the ocean floor.
What percentage of all sediments carried off by rivers in Madagascar comes from gullies known as lavakas?
These features account for 84 percent of all sediments carried off by rivers in the region.