Name _______________________________________
Chapter 2
34.
Period _______ Code # ______
How are igneous rocks classified ?
35. What is meant by a felsic igneous rock ?
36. What is meant by a mafic igneous rock ?
37. What are three igneous rocks which do not fit the scheme of felsic and mafic rocks?
38.
Define vesicular.
39. What is meant by extrusion ?
Extrusion occurs when molten rock cools quickly at the earth's surface.
40. What is meant by intrusion ?
Intrusion occurs when molten cools slowly inside the earth.
41. Where do you find felsic and mafic rocks ?
Felsic igneous rocks are usually located on the continents while mafic rocks are located in the ocean basins.
42. What are sedimentary rocks created from ?
43. What is meant by compression ?
Sediments that are closely compacted together by the pressure exerted by overlying sediments , rocks or water.
44. What is meant by cementation ?
The addition of minerals dissolved in water help "glue" larger sediments together. [ex. calcite (limestone) or
Silica (quartz) ].
45. What are the most common type of sedimentary rocks ?
46.
How are organic sedimentary rocks formed ?
47.
How are chemical sedimentary rocks formed ?
48. What is meant by evaporites ?
49. What is meant by precipitates ?
A mineral crystallizes from solutions without evaporation of water . When ions combine chemically to form
insoluble compounds [ ex. dolostone ]