A sedimentary rock takes thousands to million of years to form because it is formed from lava (or magma). After thousands and millions of years, allowing the rock to cool, forms a rock shape, which we call a sedimentary rock. Please don't copy and paste this answer to present it as your own. Your Welcome!
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over thousands of years the rock begins to change
A glacier.
How sharp or dull the rock is, This process usually takes thousands of years
thousands to millions of years
Layers of sediment are pressed under the earth for thousands and millions of years, and solidify into rock.
Rock layers
no, limestone is not alive because it is not a mineral
yes it can
Scoria is a type of volcanic rock that forms from solidified lava. Its age can vary depending on when the eruption that produced it occurred. In general, scoria can range in age from hundreds to thousands of years old.
analysing cores of ice and rock formations