Macrocytic RBCs are large so tend to have a higher MCH, while microcytic red cells would have a lower value.. MCH is one of three red blood cell indices (MCHC and MCV are the other two). The measurements are done by machine and can help with diagnosis of medical problems.
Alaska's Bogoslof Volcano. Bogoslof volcano, located in the Aleutian Islands about 98 km (61 mi) northwest of Dutch Harbor/Unalaska, is in an active eruption sequence that began in mid-December 2016 and continues today.
Location of Surtsey. Map courtesy of U.S. Geological Survey. Location of the vents associated with the eruption of Surtsey. Surtla, Syrtlingur, and Jolnir are satellite vents that were active early in the eruption. Syrtlingur and Jolnir formed islands that were eroded away. Surtla grew close to but never above sea level (Kokelaar and Durant, 1983). From Moore (1985). Surtsey is a volcanic island and part of the Vestmannaeyjar submarine volcanic system. Vestmannaeyjar also produced the famous eruption of Heimaey (Eldfell). Surtsey is about 1.5 km in diameter and has an area of 2.8 square km. Surtsey is 33 km south of the main island of Iceland and 20 km southwest of Heimaey. The island is named for Surtur, a giant of fire in Icelandic mythology.