Chapter 6 – Rocks Study Guide
porphyritic texture
Silty shale
pluton
low silica content,
thin and fluid,
forms darkcolored rock
crystals
They are similar in
composition
sedimentary
geodes
gabbro
porphyry
1. The cooling and hardening of magma deep underground results in a pluton.
2. Gabbro is an example of an igneous rock.
3. Silty shale is most likely to have formed farthest from the shoreline of a body of water.
4. All intrusive igneous rocks contain crystals.
5. Sedimentary rocks do not include this feature porphyritic texture
6. Mafic magma is characterized by low silica content, thin and fluid, forms darkcolored rock
7. How are granite and obsidian similar? Similar in composition
8. Porphory is an igneous rock characterized by two distinctly different textures.
9. Fossils are most likely to be found in sedimentary rocks.
10. Geodes are small, crystal-lined spheres of silica rock that sometimes occur in limestone.
Marble and
limestone
sandstone
water moves and
relocates rock
fragments
minerals fall out
of solution
scoria
origin
pluton
calcite
magma
gabbro
11. Scoria is a mafic rock that is full of holes and made of dense minerals.
12. Ripple marks are most likely to be found in sandstone rocks.
13. In the rock cycle, rocks are classified by origin.
14. Marble and limestone are examples of a metamorphic rock and parent rock.
15. A batholiths is a type of pluton.
16. The formation of clastic rock begins when water moves and relocates rock fragments.
17. Rocks may form chemically when minerals fall out of solution
18. Gabbro is a rock that most likely formed underground from slow-cooling magma.
19. Sedimentary rocks that formed organically typically contain calcite
20. Molten rock underground is called magma.
heat
compaction
melting
Weather
lava
Erosion
pressure
cementation
21. Molten rock on Earth’s surface is called lava.
22. Metamorphic rocks are formed from heat and pressure
23. Igneous rocks are formed by melting and crystallization
24. Sedimentary rocks are formed by compaction and cementation
25. Sediments are formed from weathering, erosion, and deposition
crystallization
deposition