Name ______
Station 1
Observe this sample. It formed from the slow crystallization of magma below the Earth’s surface. If you look closely, you can see the feldspar (pink), biotite mica (black), and quartz (shiny, clear).
1. The composition of it is determined by
A. its textureC. the minerals that it’s made of
B. its colorD. the weathering of nearby rocks
2. Is it an igneous, sedimentary, or metamorphic rock? ______
3. It is considered to be a coarse-grained rock.
Would it be considered intrusive or extrusive? ______
4. Identify this rock sample. Circle the correct rock: granite gneiss limestone
Station 2
Observe this sample. It was formed from shale that had been heated and put under pressure by plate collisions.
5. Is it an igneous, sedimentary, or metamorphic rock? ______
6. Look at this sample from various angles.
Is it foliated or nonfoliated? ______
7. Identify this rock sample.
Circle the correct rock: limestone coal slate
Station 3
Observe this sample. It is very fragile – BE EXTREMELY GENTLE WITH IT. Carefully pick it up and see how light it is. It is so light because it contains a large number of gas bubbles, each surrounded by a thin layer of volcanic glass. It was formed when a thick and sticky magma was explosively blown out of a volcano. The gases that are trapped in the bubbles are the same as the gases that caused the explosive eruption. It is the only rock that floats in water.
8. Is it an igneous, sedimentary, or metamorphic rock? ______
9. Intrusive or extrusive? ______
10. Magma can be formed by
A. an increase in the temperature of the rock.
B. a decrease in the pressure on the rock.
C. a change in the composition of the rock.
D. all of the above.
11. Identify this rock sample. Circle the correct rock: obsidian pumice sandstone marble
Station 4
Observe this sample. There are several processes that contributed to its formation.
The first process involved water, wind, ice, and/or heat that broke down rock into small
pieces. This is called (12.) ______. The second process moved the sediment
from its source. This is called (13.) ______. The third process brought the
sediment to rest. This is called (14.) ______. Finally, this sediment was buried
under other sediments, (15)______by the weight of those sediments, and (16)______together by material dissolved in water that seeped through it.
17. Is it an igneous, sedimentary, or metamorphic rock? ______
18. Clastic, chemical, or organic? ______
19. Is the texture of coarse, fine
or does it not have any visible grains? ______
20. Identify this rock sample.
Circle the correct rock: halite conglomerate quartzite sandstone
Station 5
Observe this sample. It used to be limestone until it was changed by heat and pressure.
21. Is it an igneous, sedimentary, or metamorphic rock? ______
22. Foliated or nonfoliated? ______
23. Identify this rock sample.
Circle the correct rock: pumice quartzite marble granite
Station 6
Observe the shells in this sample. It formed at the bottom of an ocean from the shells, corals and skeletal remains of organism.
24. Are these igneous, sedimentary, or metamorphic rocks? ______
25. Clastic, chemical, or organic? ______
26. Identify this rock sample.
Circle the correct rock: limestone breccias marble
Station 7
Observe this sample. It was formed when minerals dissolved in a water solution evaporated leaving behind these crystals. When it breaks it has (27.) ______and the special property of a salty taste.
28. Is it an igneous, sedimentary, or metamorphic rock? ______
29. Clastic, chemical, or organic? ______
30. Identify this rock sample.
Circle the correct rock: marble pumice halite
Station 8
Observe this sample. It was formed when (30)______from a volcano cooled rapidly. It does not have any visible grains and is glassy. When broken it has a recognizable fracture.
32. Is it an igneous, sedimentary, or metamorphic rock? ______
33. Intrusive or extrusive? ______
34. Identify this rock sample.
Circle the correct rock: slate obsidian breccias
Station 9
Both of these samples are (35.) ______grained. They are both sedimentary rocks and were both formed when rock particles were compacted and cemented together.
36. Are they clastic, chemical, or organic? ______
Use these choices to answer questions 36 and 37:
basalt granite breccias sandstone shale conglomerate halite
37.The rocks with the rounded edges are ______
38. The rocks with the jagged edges are ______
Station 10
Observe this sample. It was formed when great amounts of pressure and some heat from a nearby pool of magma softened granite (did not melt it).
39. Is it an igneous, sedimentary, or metamorphic rock? ______
40. It has distinct layering
making it foliated or nonfoliated? ______
41. Identify this rock sample.
Circle the correct rock: granite limestone gneiss
Station 11
This is one of the most abundant rocks on Earth. It was formed when lava cooled rapidly making it an (42. circle one) intrusive or extrusive. It has a fine grain.
Due to its (43. circle one) low or high silica content it is dark colored.
44. Is it an igneous, sedimentary,
or metamorphic rock? ______
45. Identify this rock sample.
Circle the correct rock: granite basalt gneiss limestone
Station 12
This rock use to be sandstone. It changed when great amounts of pressure caused the weakly cemented quartz particles to recrystallize.
46. Is it an igneous, sedimentary, or metamorphic rock? ______
47. Foliated or nonfoliated? ______
48. Identify this rock sample.
Circle the correct rock: quartzite gneiss breccias basalt