5. What term is used to describe the size and arrangement of the crystals in an

Question

5. What term is used to describe the size and arrangement of the crystals in an igneous rock?   

6. What process has a great effect on this term?                                                                   

7. What can be said of the texture of an igneous rock that cools at the surface of Earth?   

8. Give an example of the name of a rock with this description of texture?                                   

9. What rock is the result of a non-orderly (amorphous) structure?                                    

10. What igneous rock floats in water?   

11. What are the three basic categories of texture for igneous rocks?

Explanation / Answer

5. What term is used to describe the size and arrangement of the crystals in an igneous rock?

Ans. The term which is used to describe the size and arrangement of the crystals in an igneous rock is called texture.

6. What process has a great effect on this term?

Ans. Cooling or crystallization process.

7. What can be said of the texture of an igneous rock that cools at the surface of Earth?

Ans. When an igneous rock cools at the surface of Earth, it crystallize rapidly, and there is not enough time to grow the crystals. As a result aphanitic igneous rock formed, individual crystals are not distinguishable to the naked eye.

8. Give an example of the name of a rock with this description of texture?

Ans. Basalt, Rhyolite.

9. What rock is the result of a non-orderly (amorphous) structure?

Ans. Pumic, obsidian.

10. What igneous rock floats in water?

Ans. Pumic floats in water, due to its high porous nature.

11. What are the three basic categories of texture for igneous rocks?

Ans. Three basic categories of texture for igneous rocks are:

a) Phaneritic: They are composed of large sized crystal that canbe visible in naked eye.

b) Aphanitic: Here mineral grains are very small and are not distinguishable in the naked eye.

c) Glassy: They are composed entirely of glass.

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