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.
Carol Ryrie Brinkâs Followers (64) Carol Ryrie Brink. Born Caroline Ryrie, American author of over 30 juvenile and adult books. Her novel Caddie Woodlawn won the 1936 Newbery Medal. Brink was orphaned by age 8 and raised by her maternal grandmother, the model for Caddie Woodlawn. She started writing for her school newspapers and continued that in college.