Rhyolite caldera complexes are the most explosive of Earth's volcanoes but often don't even look like volcanoes. They are usually so explosive when they erupt that they end up collapsing in on themselves rather than building any tall structure (George Walker has termed such structures inverse volcanoes).
A normal serum sodium level is between 135 and 145 milliequivalents per liter. As this value can vary from laboratory to laboratory, it is important to consult with your physician to get a proper assessment.
The normal level of sodium in the blood is between 135 mEq/L (milliequivalents per liter) and 145 mEq/L. A level below 135 is low and is called hyponatremia. Because there are many causes of hyponatremia, I first try to determine whether some other substance is taking up space in the blood volume.