These rocks usually formed where it was really hot like deep down in the earth or at volcanoes. Metamorphic rocks are rocks that we once different from what theay are now. That is to say, that they have been changed or metamorphosed from what they once were. This process occurs by taking a rock, and subjecting it to heat or pressure or a mixture of both. The original rock may have been igneous, sedimentary, or even another metamorphic rock, it really doesn t matter, but the new rock is much different.
Sedimentary rocks are rocks that are laid down or deposited by wind or water.
They are formed from small particles or clasts that are cemented together by a glue or matrix. The clasts can be made of any kind of rock and they are the key to understanding what was going on when they were being deposited. Within the surrounding area, all of the three rock types are present. Right here in Schenectady there are sedimentary rocks. A little to the north, igneous and metamorphic rocks are present in the Adirondacks.