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61
In which type of rocks are metals like gold and copper mostly found?
Discuss
Answer & Solution
Answer: Option B
Solution:
In old Igneous type of rocks metals like gold and copper mostly found. Gold and copper are found in ore bodies associated with porphry. Porphry is a general term applied to igneous rocks of any composition that contain conspicuous phenocrysts (crystals) in a fine-grained groundmass.
62
The breaking up of the rocks at its place is known as
Discuss
Answer & Solution
Answer: Option B
Solution:
Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth. Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering.
63
In due course of time the meander loop cuts off from the river and forms a cutoff lake, also called an ________ lake.
Discuss
Answer & Solution
Answer: Option A
Solution:
An oxbow lake is formed by both erosional and deposition actions of a river. In lower course a river dominates in lateral erosion and bend is created by it. On outer end of bend erosion dominates and on inner end deposition dominates and finally a loop is separated known as oxbow lake.
64
The material carried by the glacier such as rocks big and small, sand and silt gets deposited, which are called glacial ________.
Discuss
Answer & Solution
Answer: Option A
Solution:
When a glacier moves downward rock debris are produced due to friction. These debris, rocks and earth (mud) gets accumulated on top, foot and sides of the glacier an are called Moraines.
65
Carbonaceous rocks which produce coal and of belong to the category of rocks called
Discuss
Answer & Solution
Answer: Option C
Solution:
Carbonaceous rocks which produce coal and of belong to the category of rocks called Sedimentary rocks. Carbonaceous rocks are a type of the sedimentary rocks formed by the deposition of sea plants which remained buried for a long period of time.
66
Which one of the following reflects back more sunlight as compared to other three?
Discuss
Answer & Solution
Answer: Option C
Solution:
Land covered with fresh snow reflects back more sunlight as compared to other three. Fresh snow and ice reflect 80 - 85% of the sunlight. Therefore, the skin of skiers is irradiated by sunlight from all sides, since the snow does not take up the light but reflects it and remains cold. Scientists give a name to this ability of surfaces to reflect light.
67
Which of the following is not a result of underground water activity?
Discuss
Answer & Solution
Answer: Option D
Solution:
Fiords or fjords are coasts formed by the submergence of U- shaped glacial troughs. These are narrow inlets of the sea into the seacoast bounded by steep and high mountain slopes, the height matched by its vast depth too.
68
A block of the earth's crust that has remained in position while the ground around it has subsides is known as ________
Discuss
Answer & Solution
Answer: Option A
Solution:
A horst is the raised fault block bounded by normal faults. It is a raised block of the Earth's crust that has lifted, or has remained stationary, while the land on either side has subsided.
69
Choose the correct statement about Sedimentary rocks ________
Discuss
Answer & Solution
Answer: Option D
Solution:
Sedimentary rocks have layers because of different depositions of sediments (small broken pieces of rocks) over time. The different groups of sediments could have been deposited through wind, water, ice, and/or gravity at different intervals of time and compacted on top of each other, until they create a sedimentary rock that has several different types of sediments (possibly from different rock types) in the form of layers.
70
Which of the following is not an agent which produces physical features ?
Discuss
Answer & Solution
Answer: Option D
Solution:
Conduction is not an agent which produces physical features. In conduction, heat moves from areas of more heat to areas of less heat by direct contact. Warmer molecules vibrate rapidly and collide with other nearby molecules, transferring their energy.