Over millions of years silt washed into a lake formed layers of sedimentary rock. what type of rock was likely formed?

the answer is quartz

Quartz

Explanation:

Quartz is a mineral of many varieties that consists mainly of silica (silicon dioxide). This would most likely be the type of rock that would be formed if over millions of years silt washed into a lake, forming layers of sedimentary rock. Quartz has been a valued mineral since antiquity. Although they tend to be quite clear, quartz can show minor impurities such as lithium, sodium, potassium and titanium.

it takes hundreds of years to become stable.

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