1 Brazil nuts contain high levels of minerals such as selenium, magnesium, copper, manganese, potassium, calcium, iron, phosphorus, and zinc. 2  Magnesium is a key nutrient in a whole host of biological processes. Dark, leafy greens are rich sources of minerals, but spinach in particular contains an abundance of magnesium, calcium, potassium, manganese, and zinc.
There are three kinds of plate tectonic boundaries: divergent, convergent, and transform plate boundaries. This image shows the three main types of plate boundaries: divergent, convergent, and transform. Image courtesy of the U.S. Geological Survey.
Plate Margins. The surface of the earth is divided into seven major and eight minor plates. Each plate is in motion relative to its neighbours, resulting in geological activity at the plate boundaries. It is also possible, though less common, for geological activity to take place in the middle of plates. There are three types of plate boundaries: divergent, convergent and conservative. Divergent. Convergent. Conservative. Mid plate tectonic activity