Answer:
tiny crystals of the mineral quartz, which is made out of silica and oxygen
The form of heat transfer taking place in the crust of the Earth would be Convection.
Answer:
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Explanation:
Tollens' reagent is prepared by using two-step process : -
Step 1:
Silver oxide is formed by mixing aqueous silver nitrate with base like sodium hydroxide. The reaction is shown below as:

Step 2
Ammonia solution is drop-wise added until all the silver oxide dissolves to form the reagent. The reaction is shown below as:
