The hemoglobin test is often used to check for anemia, usually along with a hematocrit or as part of a complete blood count (CBC) . The test may be used to screen for, diagnose, or monitor a number of conditions and diseases that affect red blood cells (RBCs) and/or the amount of hemoglobin in blood.he hemoglobin test is often used to check for anemia, usually along with a hematocrit or as part of a complete blood count (CBC) . The test may be used to screen for, diagnose, or monitor a number of conditions and diseases that affect red blood cells (RBCs) and/or the amount of hemoglobin in blood.
Volcanoes form at hot spots in the Earth's crust, at convergent plate boundaries where subduction of oceanic crust is occurring, and at divergent plate boundaries where gaps i â¦ n the crust are being infilled with rising magma.
When magma reaches the surface, it is called lava. When lava has cooled, it forms a type of rock called igneous rock, which means âfrom fireâ. Volcanoes can form in 3 major ways: 1. Volcanoes at Convergent Boundaries Most volcanoes form at convergent boundaries called subduction zones. At these boundaries, oceanic plates subduct below continental plates. As the denser oceanic plate sinks down, heat from the Earth melts the plate and the rock becomes magma.