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17. climate refers to the average conditions in an area.

18. chemical reactions occur faster at temperatures.

19. look at the apply it box. stone 1/stone 2 has weathered more.

20. what might explain the difference?

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.

The basic building blocks of dna and rna are nucleotides