Check for Provide an accessible overview (MOS:INTRO): Done
Major Point 1: Early life "A graduate of Harvard University, Birch began working on geophysics as a research assistant. He subsequently spent his entire career at Harvard working in the field, becoming an Associate Professor of Geology in 1943, a professor in 1946, and Sturgis Hooper Professor of Geology in 1949, and professor emeritus in 1974. He published over 100 papers." (summarised well in the lead)
Major Point 2: World War II "During World War II, Birch participated in the Manhattan Project, working on the design and development of the gun-type nuclear weapon known as Little Boy. He oversaw its manufacture, and went to Tinian to supervise its assembly and loading into Enola Gay, the Boeing B-29 Superfortress tasked with dropping the bomb." (summarised well in the lead)
Major Point 3: Post-war "In 1952 he published a paper in which he demonstrated that Earth's mantle is chiefly composed of silicate minerals, the upper and lower mantle are separated by a thin transition zone associated with silicate phase transitions, and the inner and outer core are alloys of crystalline and molten iron. His conclusions are still accepted today." (not a concise summary of the corresponding section in the body, "1952 paper" should be skimmed and other points should be included.)
Check for Relative emphasis: Done
Major Point 1: Early life "A graduate of Harvard University, Birch began working on geophysics as a research assistant. He subsequently spent his entire career at Harvard working in the field, becoming an Associate Professor of Geology in 1943, a professor in 1946, and Sturgis Hooper Professor of Geology in 1949, and professor emeritus in 1974. He published over 100 papers." (the lead gives due weight as is given in the body)
Major Point 2: World War II "During World War II, Birch participated in the Manhattan Project, working on the design and development of the gun-type nuclear weapon known as Little Boy. He oversaw its manufacture, and went to Tinian to supervise its assembly and loading into Enola Gay, the Boeing B-29 Superfortress tasked with dropping the bomb." (the lead gives due weight as is given in the body)
Major Point 3: Post-war "In 1952 he published a paper in which he demonstrated that Earth's mantle is chiefly composed of silicate minerals, the upper and lower mantle are separated by a thin transition zone associated with silicate phase transitions, and the inner and outer core are alloys of crystalline and molten iron. His conclusions are still accepted today." (the lead gives due weight as is given in the body)