Frequent changes in temperature can cause cracks to form in rock formations ?

Temperature changes, pressure changes, plant and animal actions, water, wind and gravity. a rise in temperature causes a rock to expand and a decrease in temperature causes a rock to contract. Also known as frost wedging can cause rocks to physically break apart. Cracks in rocks expand as water seeps in and freezes.

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nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides