Lettuce. Lettuce is a fairly hardy, cool-weather vegetable that thrives when the average daily temperature is between 60 and 70Â°F. It should be planted in early spring or late summer. At high temperatures, growth is stunted, the leaves may be bitter and the seedstalk forms and elongates rapidly.ipburn is a physiological condition that causes lettuce to die back at the edges of the leaves. It results from a change in the moisture relationship between the soil and the plant. Clip off any brown leaf tissue and use the remainder of the leaf.
chromosphere. A layer of gas that lies above the photosphere of a star, such as the Sun. Thesaurus Antonyms Related Words Synonyms Legend: Switch to new thesaurus . Noun: 1. chromosphere - a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun layer - a relatively thin sheetlike expanse or region lying over or under another
The core is the center of the sun and is responsible for producing the star's light and heat. The core is a fusion engine, fusing atoms of hydrogen to produce helium and a tremendous amount of energy. The temperature in the core is around 28,000,000Â°F or 15,700,00Â°C.The radiative zone extends from the core to a distance of about 70 percent of the way out from the center of the sun. Energy produced in the core radiates outward to the edge of the sun through this zone.he chromosphere is the coolest layer of the sun at 7,500Â°F, or 4,100Â°C, where it is closest to the photosphere. As it approaches the outermost layer of the sun, it gets hotter. The chromosphere is a pinkish-red color and is punctured by hot jets of gas.