Geography Class 6th MCQs=483

• Rocks (چٹان): Any mass of natural deposit which forms solid part of the Earth’s crust is called rock.
  
• Rocks: Combination of two or more minerals.
  
• Types of Rocks: There are three types of rocks.
• a) Igneous rocks آتشی  چٹانیں)                   )
• b) Sedimentary rocks تہہ دار یا رسوبی چٹانیں )    )
• c) Metamorphic rocks (تبدیل شدہ یا متغیر چٹانیں)
  
• Igneous rocks (آتشی چٹانیں):
  
• These rocks are formed by cooling of hot molten matter inside or outsides the earth.
  
• Igneous rocks are bright and mostly hard, solid and do not absorb water.
• There are two types of igneous rocks.
  
• 1) Intrusive igneous Rocks                  2) Extrusive Igneous Rocks
• Intrusive igneous Rocks: At very depth temperature is very high and materials there are in molten state.
• This hot molten material is called magma. When this magma cools and solidify inside the earth intrusive igneous rocks are formed.
  
• Plutonic rocks, sills and dykes etc. is the example of intrusive igneous rocks.
  
• Extrusive Igneous Rocks: When the molten matter comes on the surface of the Earth and solidifies, the rocks thus formed are called extrusive igneous Rocks. Its color is dark.
• Basalt and volcanic mountain is the example of Extrusive igneous rocks.
• Sedimentary rocks (تہہ دار یا رسوبی چٹانیں ):
  
• Sedimentary rocks are formed by the natural process of water, wind, ice etc. Due to the pressure and weight of the above layers these materials changed in to the solid rocks which are called sedimentary rocks. 
• Sand stone, clay, chalk, limestone etc. are the example of these types of rocks.
• Metamorphic rocks (تبدیل شدہ یا متغیر چٹانیں):
  
• These types of rocks change its form and characteristics due to heat and pressure.
• Slate, graphite, marble etc. are the example of metamorphic rocks.
• Element: An element is the simples Sedimentary t form of matter. All the things found in earth are made of elements.
• Volcanism: When lava is coming out from volcanic mountain.
• Limestone change into Marble due to heat and pressure.
• Surface of the earth mostly composed of sedimentary rocks.

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MCQs                                                                                                 .

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Any mass of natural deposit which forms solid part of the Earth’s crust is called ……….
a) soil                          
b) surface
c) rock                        
d) none of these

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The branch of geology which deals with various aspects of rocks is………….
a) Petrology               
b) Mineralogy
c) Lithology                
d) Rockology

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How many types of rocks?
a) 2     
b) 3                 
c) 4     
d) 5

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The word igneous derived from a Latin word “ignis” which means……….
a) soft 
b) water          
c) fire
d) hard matter

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