Sodium (Na) in Blood. Guide. A sodium test checks how much sodium is in the blood. Sodium is both an electrolyte and mineral. It helps keep the water (the amount of fluid inside and outside the body's cells) and electrolyte balance of the body. Sodium is also important in how nerves and muscles work.hy It Is Done. A blood test to check sodium levels is done to: 1  Check the water and electrolyte balance of the body. 2  Find the cause of symptoms from low or high levels of sodium.
Many of the lakes on the Canadian Shield, including those of the Great Lakes, were created by glacial erosion. Glacial Deposition A large part of the surface of a glacier is covered with a coating of sediment and rock debris.
If enough sediment is eroded away in one place, it can begin to form erosional landforms. A bay at place where a river meets the sea is an excellent example of an erosional landform. The size, shape, and scope of a bay can vary drastically by the composition of the rocks and soil surrounding it.ven places like the famous Haystack Rock off the Oregon coast is an example of an erosional landform. At one time, this magnificent piece of rock was once a part of a cliff-like shoreline. Over time, the force of the ocean eroded it away.