GEOLOGY

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EARTH SCIENCE

STRUCTURAL GEOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Grain size affects the the strength of rocks. Temperature constantly increases from surface to the core.
A
Both statements are true.
B
Statement 1 is true. Statement 2 is false.
C
Statement 2 is true. Statement 1 is false.
D
Both statement are false.
Explanation: 

Detailed explanation-1: -The grade of metamorphism is primarily controlled by temperature. As temperature increases, the grain size of the minerals in a metamorphic rock increases. The most common names are derived from the metamorphism of shale.

Detailed explanation-2: -Changes in temperature cause rock to expand (with heat) and contract (with cold). As this happens over and over again, the structure of the rock weakens. Over time, it crumbles. Rocky desert landscapes are particularly vulnerable to thermal stress.

Detailed explanation-3: -Answer and Explanation: The process of recrystallization changes the grain size of a metamorphic rock. This occurs when there is enough pressure from the Earth’s crust to rearrange the atoms within the rock itself.

Detailed explanation-4: -Mechanical strength largely increases with increasing grain size.

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