1. Igneous Rocks
Eric Angat
Teacher

2. How do I identify an igneous rock?
Essential Question
How do I identify an igneous rock?

3. Instructions
Answer the clarifying questions individually (20 minutes).
When done in answering all 15 questions, your teacher will tell you to group yourselves together and then distribute the bags of igneous rocks.
2. Read and follow the instructions. Talking too much deprives you and others of needed learning so you need to be quiet and focus on the task at hand. You will receive a consequence such as detention or ISS if you do not follow instructions.
3. Observe each rock and record your observations on your activity papers.

5. Extrusive igneous rock-on the surface
Felsic Igneous rock
Mafic
Igneous rock
Small
Crystals
Extrusive igneous rock-on the surface
Intrusive igneous rock-
( pluton) underground
Big
Crystals

6. 1. What is rock texture?
The texture of a rock refers to its grain or mineral crystal size.
MIXED FINE AND COARSE
Big crystals
Small crystals
Mica=black
Feldspar=brown
Quartz=white
Porphyritic texture
Coarse texture
Fine texture

7. 1. What is rock texture?
The texture of a rock refers to its grain or crystal size.
Breccia-mixture of large and small grains.
Very small crystals
Big pores or holes.
Pyroclastic
texture
Glassy texture
Vesicular texture

8. Breccia-mixture of large and small angular grains.
MIXED FINE AND COARSE
Breccia-mixture of large and small angular grains.
Porphyritic texture
Pyroclastic
texture

9. 2. How do Igneous rocks form?
Extrusive rocks- example is basalt.
Intrusive rocks- example is granite.

10. 3. What are the types of Igneous Rocks

11. Cooled lava forms basalt igneous rocks
Moai Statues (Easter Island) Basalt, trachyte, and scoria
Basalt (extrusive rock) and granite (intrusive rock) are two of the most common igneous rock types on the Earth, and cover most of the igneous deposits on the planet. Usually, the rocks in deep ocean floors are known to be basaltic in nature, while the rocks in the continental mass are granitic in nature. Owing to their interlocked crystals, igneous rocks boast of a strong and stable structure, which, in turn, makes them highly popular in the world of architecture. Each igneous rock variety has uses of its own; some are used for kitchen counters, some for decorative purpose, and some for interior designing and jewelry making. Igneous rocks have been used in architectural construction for several centuries. In fact, some of the most famous monuments in the world have been built using these rocks and therefore, it would be a bit harsh on our part to ignore these monuments when compiling interesting facts about this rock type. Read more at Buzzle: 
Mount Rushmore (USA) Granite
Cooled magma form granite igneous rocks

12. The two types igneous rocks

13. 4. How do igneous rocks form from subduction?
1.Oceanic
lithosphere
sinks to the
asthenosphere.
3.Lava cools to become extrusive rocks.
volcanoes
2.Magma cools to become intrusive rocks.
Plate melts to become magma.
subduction

14. To compare relative sizes

15. 5. The parent material for all rocks is
A. silica B. quartz C. granite D. magma

16. 6. Which of the following types of rock is produced by magma that cools deep below the earth's crust?
A. extrusive igneous B. intrusive igneous C. foliated metamorphic D. chemical sedimentary

17. 7.The size and arrangement of crystal grains in igneous rocks is called
A. density B. texture C. hardness D. luster

18. 8.The texture of igneous rock is determined by the rate at which magma
A. flows from a volcano B. cools C. melts D. compresses
Slow cooling =big crystals
Fast cooling=small crystals

19. 9. An igneous rock with a mixture of large and small grains is
A. a porphyry B. an intrusion C. an extrusion D. a breccia

20. dark colored and has big crystals.
10. An igneous rock that is
dark colored and has big
crystals.
Felsic, intrusive, fine crystals
Mafic, extrusive, coarse grain
Mafic, intrusive, coarse grain
Felsic, extrusive, fine grain

21. What is the Rock Cycle? https://www.youtube.com/watch?v=55n_ep952ro