Why does a coastal area have less variation in temperatura than a noncoastal area?

The temperatures on land change more rapidly than temperatures on water.

Due to high specific heat capacity of water as compared to land

Explanation:

The specific heat capacity of water is much higher as compared to land. Specific heat is the amount of heat required to raise the temperature of anything by a unit degree ( of either Celsius or Fahrenheit).  

Thus, water in ocean and coastal areas take much longer time to heat. In the same way coastal areas need much longer time to release the absorbed heat. Thus, the temperature is coastal area is more or less stable as compared to non coastal areas where cooling and heating of the atmosphere takes place quickly.

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an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.