A layer of sandstone is found on top of a layer of limestone in a geologic cross section. What does this tell you about how the sea level changed in that area?

Question

I know how metamorphic rocks are formed but how are metamorphic rocks formed into other metamorphic rocks?

Answer 1

Check these sites.

http://www.fi.edu/fellows/fellow1/oct98/expert/limestone.htm

http://geology.about.com/library/bl/images/blsandstone.htm

http://www.bobspixels.com/kaibab.org/geology/gc_layer.htm

http://en.wikipedia.org/wiki/Metamorphic_rock