The continent can be broken into four major landform regions: the Coastal Plains, the Eastern Highlands, the Central Lowlands and the Western Plateau. These landform regions have been created by movements in the Earth's crust, river erosion and changes in climate and sea level.
Causes of Low HGB and Low HCT. Figuring out hematocrit levels in the blood is done through Mean Corpuscular Volume or MCV and Red Cell Distribution Width or RDW. These tests determine whether someone is suffering from low Hgb and/or low HCT levels in their blood and can help doctors determine a cause. 1.Anemia is the direct result of a low red blood cell count.iguring out hematocrit levels in the blood is done through Mean Corpuscular Volume or MCV and Red Cell Distribution Width or RDW. These tests determine whether someone is suffering from low Hgb and/or low HCT levels in their blood and can help doctors determine a cause.
1 High levels of hemoglobin usually indicate high red blood cell counts and dehydration. 2  Low levels indicate anemia, bleeding or iron deficiency. 3  HCT is an abbreviation for hematocrit. 4  The hematocrit is a calculated percentage of red blood cells in the circulation. MCHC is an abbreviation for mean corpuscular hemoglobin concentration. 2  This is the average percentage of hemoglobin in each red blood cell. 3  A high MCHC indicates that there is too much hemoglobin in the red blood cell, indicating a high iron level since an important component of hemoglobin is iron.