1. Chapter 4: section 3

2.  Metamorphic rocks are rocks that have been changed because of changes in temperature and pressure or due to the presence of hot watery fluids.  Metamorphic rocks may form from igneous, sedimentary rock, or other metamorphic rocks.  Example: granite  gneiss

4.  Rocks beneath the Earth’s surface are under great pressure from the rocks above them.  Temperature will increase with depth in the Earth.  Underneath the Earth some minerals will melt or dissolve and recrystalize.  Example: Shale  Slate  phyllite  schist  gneiss  Each different type of metamorphic rock can come from multiple parent rocks.

7.  Fluids can move through rock and change the rocks composition.  Example: Water and carbon dioxide  What are fluids?

8.  Texture and mineral composition determine how a metamorphic rock is classified. Foliated – layers Nonfoliated – no layers  Physical properties of metamorphic rocks, such as the watertight nature of slate, make them useful for many purposes.

9.  Foliated Rocks When mineral grains line up in parallel layers, the metamorphic rock is said to have foliated texture.  Ex. Slate and gneiss Shale  slate Shale: (minerals arrange into layers with heat and pressure.) Slate: Slate is watertight and easily split into layers Uses: patio and pools

10.  Nonfoliated rocks describe metamorphic rock, such as quartzite or marble, whose mineral grains grow and grow but do not generally form layers.  Grains of quartz  sandstone  quartzite