Let's understand how a sedimentary rock like sandstone forms:

1. **Weathering:** Rain, wind, and temperature changes break down a big mountain (made of igneous or metamorphic rock) into tiny bits of sand and dust. This is like how a strong wind can break off small pieces from an old wall.
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2. **Erosion & Transport:** Rivers and wind carry these tiny sand particles far away. Think of a truck carrying construction sand from one city to another.
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3. **Deposition:** When the river slows down (maybe entering a lake or ocean), the sand particles settle at the bottom, forming layers. This is similar to how dust settles on your furniture if you don't clean it.
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4. **Compaction:** Over millions of years, more and more layers of sand pile up. The weight of the upper layers presses down on the lower layers, squeezing out water and air. This is like pressing down on a pile of clothes to make it smaller.
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5. **Cementation:** Natural minerals dissolved in water (like silica or calcium carbonate) act like glue, filling the spaces between the sand grains and binding them together. This is similar to how cement binds sand and gravel to make concrete.
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**Result:** After these steps, the loose sand has turned into a hard sedimentary rock called sandstone.