Grouping practices for reading instruction play a critical role in facilitating effective implementation of both reading instruction and inclusion of students with disabilities in general education classes.
What drives the process of plate tectonics. Tectonic plates are pieces of the Earth's crust and uppermost mantle, together referred to as the lithosphere. The plates are around 100 km thick and consist of two principal types of material: oceanic crust and continental crust. The composition of the two types of crust differs markedly, with basaltic rocks dominating oceanic crust, while continental crust consists principally of lower density granitic rocks.
Together, the crust and upper portion of the mantle â called the lithosphere â are where most important geological processes occur, such as mountain-building, earthquakes and the source of volcanoes. The slow churning and overturning of the mantle is what drives the movements of Earth's tectonic plates.