The blood pressure decreases and complaints, such as fatigue and lassitude, make themselves felt. These symptoms may also occur after the meal because the blood gathers in the area of the digestive organs and is missing in the brain. Dizziness.
Metamorphic rocks have been modified by heat, pressure and chemical processes, usually while buried deep below Earth's surface. Exposure to these extreme conditions has altered the mineralogy, texture and chemical composition of the rocks. There are two basic types of metamorphic rocks. Foliated metamorphic rocks such as gneiss, phyllite, schist, and slate have a layered or banded appearance that is produced by exposure to heat and directed pressure.
Metamorphic rocks are forming deep in the core of these mountain ranges. As the mountain ranges are eroded away over millions of years, the metamorphic rocks are eventually uncovered. A good example of where this has happened is the Appalachian Mountains in the Eastern United States. The Appalachian Mountains used to be a very large mountain range. Over time the mountains have eroded away and we now can see many different types of metamorphic rocks in the region.