Name _______________________________________
Chapter 2
Period _______ Code # ______
18. What is meant by specific gravity or relative density ?
19.
Define transparency .
A substance allows light to pass through and can be seen through clearly .
20.
Define translucent.
A substance which allows some of the light to pass through and cannot be seen so clearly .
21.
Define opaque .
A substance that does not allow light to pass through at all .
22. What are rocks composed of?
23.
How are rocks classified ?
24.
How are igneous rocks formed ?
25.
How are sedimentary rocks usually formed ?
26.
How is a metamorphic rock created ?
27.
Define texture.
28. What occurs when magma cools to about 600 to 1000 C?
29. What is meant by crystallization ?
30. What does the size of crystals indicate about igneous rocks ?
31. What size crystals results from slow cooling of magma?
32. What size crystal results from rapid cooling of magma?
33. What often occurs with super rapid cooling of magma?