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.
The volcanoes in this region form a belt called the Ring of Fire. Some of these volcanoes are found in the western United States and Canada. 2. Volcanoes at Divergent Boundaries Volcanoes also form along divergent boundaries where tectonic plates pull apart, allowing magma to rise from the mantle.
Volcanoes are formed by upwelling of magma (hot molten rock) deep under the earth's surface. No one is quite sure why magma rises in certain areas, but when it does, it forms pockets which create pressure on the rock of the Earth's crust. volcano is an opening, or rupture, in a planet's surface or crust, which allows hot magma, volcanic ash and gases to escape from below the surface. Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface.