Class 11 Geography Important Chapter 6 Minerals and Rocks: Components of the Earth’s Crust

Class 11 Geography Important Chapter 6 Minerals and Rocks: Components of the Earth’s Crust Solutions English Medium As Per AHSEC New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters ASSEB Class 11 Geography Important Solutions and select need one. AHSEC Class 11 Elective Geography Additional Notes English Medium Download PDF. HS 1st Year Finance Important Solutions in English.

Class 11 Geography Important Chapter 6 Minerals and Rocks: Components of the Earth’s Crust

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Minerals and Rocks: Components of the Earth’s Crust

Chapter: 6

THIRD UNIT : GEOMORPHIC FEATURES AND THEIR EVOLUTIONARY PROCESS

IMPORTANT QUESTION AND ANSWER

Answer The Following Questions:

1. What is a Rock?

Ans: The solid outer part of the Earth’s surface is mainly made up of rocks. A physical mixture of one or more minerals is called a rock.

2. Sand, clay, and silt belong to which category?

Ans: Sand, clay, and silt belong to the category of rocks.

3. In which rock type do sandstone change into quartzite, limestone into marble, and shale into slate?

Ans: In metamorphic rocks, sandstone changes into quartzite, limestone into marble, and shale into slate.

4. What are the basic elements of mica?

Ans: The basic elements of mica are potassium, aluminium, magnesium, iron, and silica.

5. What is a Fossil?

Ans: The remains, imprints, or traces of organisms preserved in sedimentary rocks are called fossils.

6. What is the meaning of the term “Batholith”?

Ans: The word “Batholith” means a large mass of intrusive igneous rock deep beneath the surface.

7. What is the colour of the rock called Gabbro?

Ans: The colour of Gabbro rock is black.

8. What is the colour of Quartzite?

Ans: The colour of Quartzite is white.

9. How are sedimentary rocks like sandstone, conglomerate, and shale formed?

Ans: Rocks like sandstone, conglomerate, and shale are formed due to the physical alteration of inorganic materials.

10. Where in Northeast India is slate found?

Ans: Slate is found in Nagaland, Mizoram, and Meghalaya in Northeast India.

Long Question & Answer:

1. Mention any four characteristics of minerals.

Ans: (i) Feldspar: All feldspars contain silicon and oxygen, along with sodium, potassium, calcium, and aluminium. Feldspar forms nearly half of the Earth’s crust. It is used in glass and ceramic industries.

(ii) Quartz: Found in granite and sandstone, its main element is silica. It is hard and insoluble in water. Colourless or white quartz is used in glass and optical instruments.

(iii) Pyroxene: Formed from calcium, aluminium, magnesium, iron, and silica. It makes up one-tenth of the Earth’s crust and appears in dark green or black colour.

(iv) Amphibole: Made from aluminium, calcium, silica, iron, and magnesium. It forms about 7% of the crust and includes minerals like hornblende.

2. Describe the Rock Cycle.

Ans: Rocks do not remain in the same form forever; they continuously change from one type to another in a cyclic manner.

(i) Igneous rocks form first through the cooling of magma.

(ii) These rocks break down through weathering and erosion to form sediments.

(iii) Sediments get compacted and cemented to form sedimentary rocks.

(iv) Sedimentary or igneous rocks may undergo heat and pressure, forming metamorphic rocks.

(v) Metamorphic rocks may melt again to form magma, completing the cycle.

This continuous transformation process is called the Rock Cycle.