This boundary is known as the Bullen discontinuity, or sometimes as the Lehmann discontinuity. A few years later, in 1940, it was hypothesized that this inner core was made of solid iron; its rigidity was confirmed in 1971. The outer core was determined to be liquid from observations showing that compressional waves pass through it, but elastic shear waves do not â or do so only very weakly.
Flannery Literary is a Chicago area literary agency representing writers of books for children and young adults because the most interesting, well-written, and time-honored books are written with young people in mind.
Like Mr. Immelt, Mr. Flannery is a company veteran, having begun at GE Capital in 1987 with a focus on evaluating risk for big corporate lending deals. In 2013, he took over business development at the corporate level, and he was involved in G.E.âs sizable acquisition of Alstomâs energy businesses and the shrinking of GE Capital.