Assertion (A) : Granite has larger crystals than basalt. Reason (R) : Basalt has larger content of metallic minerals. Which one of the following is correct ?
Both (A) and (R) are true and (R) is not the correct explanation of (A)
Granite is an intrusive igneous rock that cools slowly deep inside the crust, which gives crystals time to grow, so it is coarse grained; basalt is an extrusive rock that cools quickly at the surface and is fine grained. The Assertion is therefore true.
Basalt is a mafic rock rich in iron and magnesium bearing minerals such as pyroxene, olivine and magnetite, while granite is felsic and rich in quartz and feldspar. The Reason is also true.
However, crystal size depends on the rate of cooling, not on the metallic mineral content, so the Reason does not explain the Assertion.
Hence, Both (A) and (R) are true and (R) is not the correct explanation of (A).
Similar Questions
Which of the following terms is not applicable to the weathering process ?
Match the following:
List I List II (a) Segment (1) A portion of slope on which the angle remains approximately same (b) Element (2) An element with downslope increase in angle (c) Convex element (3) A portion of slope profile on which the curvature approximately remain constant (d) Concave element (4) An element with downslope decrease in angle Codes : (a) (b) (c) (d)
Arrange the landforms on the basis of their occurences from lowest to the highest levels : (1) Sea-cliff (2) Ridges and runnels (3) Guyot (4) Abyssal plain
The basic goal of Davisian model of cycle of erosion was _____
Which of the following is correct relation about the speed of the earthquake waves ?
Which of the following statements is correct about slopes ? (I) Weathering controlled slopes occur where actual rate of regolith production is less than the potential rate at which it can be removed. (II) Transport limited slopes are those on which the rate of regolith production is greater than the capacity of transport processes to remove it.
The most common and typical volcanic cone is _____ .
Assertion (A): Large avalanches usually occur on slopes of 30º–50º.
Reason (R): The optimum condition for geomorphologically significant avalanche, snow accumulation are on slope of 30º–50º.
Codes:
_____ is an anticlinal fold formed due to intrusion of rocks.
Which of the following statements is incorrect about thermosphere ?
Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
