cement [materials] (ce-ment'). A manufactured gray powder which when mixed with water makes a plastic mass that will "set" or harden. It is combined with an aggregate to make concrete. Nearly all of today's production is portland cement. See also: cement rock.
oncolite (on'-co-lite). A small, variously shaped, concentrically laminated, calcareous sedimentary structure, resembling an oolith, and formed by the accretion of successive layered masses of gelatinous sheaths of blue-green algae. It is smaller than a stromatolite and generally does not exceed 10 cm in diameter. Also spelled: onkolite. Cf: catagraphite.
“It’s startling to know there are individuals on the brink of adulthood who have spent their entire lives in a climate that, largely due to human activity, is vastly different from the one their parents experienced growing up.” – RACHEL LICKER, a senior climate scientist at the Union of Concerned Scientists, a research and advocacy group, after learning that last year was one of the warmest on record. (New York Times quote of the day, Friday, January 18, 2018.
Not many people are able to combine their work and hobbies the way Craig Clements, a meteorologist at San Jose State University in California, has. “I was always interested in mountain weather,” he says. “I got into meteorology through my interest in mountaineering and climbing.”