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.
Low Hematocrit Levels. HCT tests are done by doctors to verify and see signs of anemia, diet deficiency, leukemia, sickle cell anemia, or any other medical condition. Low hematocrit levels can be a sign of hemorrhage, anemia, destruction of red blood cells, malnutrition, and over hydration. Low HCT can be due to low blood oxygen levels, pulmonary fibrosis, and congenital heart disease, among others.