Which one of the following is correct ?
Pyroxene is commonly found in meteorites
Amphiboles form about 20% of the Earth's crust
Quartz is soluble in water
The word 'sedimentary' is derived from the Latin word kelimentum
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-2 – 2024
– Amphiboles are also common rock-forming silicate minerals, but they constitute a smaller percentage of the Earth’s crust compared to feldspars and quartz. Their abundance is estimated to be around 5-7% of the continental crust.
– Quartz (silicon dioxide, SiO2) is highly insoluble in ordinary water under surface conditions, which contributes to its resistance to chemical weathering. It can be dissolved under extreme conditions (e.g., high temperature and pressure, or presence of specific chemicals), but not in typical rainwater or groundwater.
– The word ‘sedimentary’ is derived from the Latin word ‘sedimentum’, which means “a settling” or “a depositing”.