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.
It's normal for women's bodies to make these, and low levels don't cause excess hair growth. But when these amounts are too high, they can cause hirsutism and other things, like acne, a deep voice, and small breasts. High levels of male hormones and hirsutism are common in women who have: 1  Polycystic ovary syndrome , which causes small cysts, or fluid-filled sacs, to form on your ovaries.  Cushing's syndrome, which you get when you have high levels of the stress hormone cortisol for long periods of time.