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ANSWER:
Water seeps into cracks in rocks, freezes, then expands (since ice occupies a slightly larger volume than liquid water). This expansion pushes the sides of the cracks further apart. ... Rocks can slowly break down by a mechanism known as freeze-thaw weathering, or alternatively, frost wedging.
begins as a cloud of dust and gas(aka a nebula) they bound together and once a certain temperature is reached then a star is born