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.
Hot magma, melted rock below Earth's crust, rises and collects in a magma chamber deep below the surface. If the magma flows through a conduit up to a vent on the surface, then it may cause an eruption and form a volcano. Gases, lava, and pyroclastic material are erupted from volcanic vents. The mountain that forms from layers of lava and tephra is called a volcano. The word volcano comes from the name of a Roman god, Vulcan, who was the god of fire. Magma that solidifies inside a volcano can form dikes and sills. Volcanoes are classified as active, dormant or extinct.