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Rocks Review.pdfTypes of Rocks Review Packet
Work in groups to answer all questions- Class Work
Review and Reinforce Answers
Classifying Rocks
1. Coarse grained
2. Very small
3. Shape
4. Pattern
5. The rock's color, texture, and mineral composition
6. Igneous rock forms from the cooling of molten magma or lava.
Sedimentary rock forms when particles of other rocks are pressed and cemented together .
Metamorphic rock forms when an existing rock is changed by heat and pressure, or chemical reactions.
7 . Granite is light colored and has a high silica content. Gabbro is dark and has a low silica content.
8. Texture
9. grains
10. rock-forming minerals
Igneous Rocks
1. Coarse grained
2. Smooth and shiny with no visible grains
3. Fine-grained
4. basalt; the ocean's crust, shield volcanoes, and lava plateau
5. granite; mountain ranges
6. Lava that is low in silica usually forms dark colored rocks, magma high in silica forms light colored rocks.
7. Igneous rocks are hard, dense and durable.
8. Granite is a building material used in counters and buildings. Basalt is used in construction as gravel. Pumice as an abrasive in polishes.
9. extrusive
10. intrusive
Sedimentary Rocks
1. b,d,a,c.
2. clastic
3. organic
4. clastic
5. chemical
6. organic
7. clastic
8. chemical
9. clastic
10. d
11. f
12. a
13. e
14. c
15. b
16. h
17. g
Rocks from Reefs
1. calcium
2. skeletons
3. corals
4. coral reefs
5. The water is warm and shallow.
6. Below that depth not enough sunlight penetrates the water for the algae in corals to grow.
7. The limestone formed from coral reefs that developed in shallow seas that covered parts of the continents millions of years ago. When the seas later retreated the limestone was exposed.
8. Where geologists find fossils of an ancient coral reef, they know that the reef formed in an area with a warm climate and shallow ocean water. In the United States, reefs that formed millions of years ago are exposed in Wisconsin, Illinois, Indiana, Texas, New Mexico, and many other places.
9. Coral reef.
Section 5-5 Review and Reinforce
1. mantle
2. pressure
3. mineral crystals
4. Pockets of magma rising the rough Earth’s crust
can provide heat that can produce metamorphic rocks.
5. Geologists classify metamorphic rocks by the
arrangement of the grains that make up the rocks.
6. Quartzite forms when weakly cemented quartz
particles in sandstone recrystallize.
7. Marble has a fine, even grain; it is relatively easy to cut
into thin slabs; and it can be easily polished.
8. Nonfoliated
9. Foliated
10. Foliated
Section 5-6 Review and Reinforce
1. Igneous rock 2. Sedimentary rock 3. Pressure
4. Metamorphic rock 5. Magma
6. Constructive forces move rock through the rock cycle by making new igneous rock or building up Earth’s surface. Destructive forces move rock through the rock cycle when erosion begins the process of forming sedimentary rock or when subduction causes part of the crust to sink into the mantle.
7. Answers will vary. Students might describe any pathway that changes one type of rock into another.
8. Water and weather wear away the granite of the mountain, and sand grains from the granite are deposited on the ocean floor, where compaction and cementation change them to sandstone. If the sandstone is pushed deeper into the crust, heat and pressure change it into quartzite.
9. Plate movements push rocks back into the mantle, where they melt and become magma. They also cause the folding, faulting, and uplift of the crust.
10. Answers will vary. Sample answer: The rock cycle is the slow changing of rocks from one kind to another by the constructive and destructive forces on and below Earth’s surface.
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