The pH of seawater is ___, making it alkaline. Seawater has a natural buffering mechanism. Carbon dioxide in seawater and is present in the form of __ ions, which makes the seawater alkaline.

Radiometric dating is used to tell the absolute age of materials by studying the decay rate of radioactive isotopes. the decay rates of isotopes are constant and are expressed as .

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Up to what percentage of the world's flora consisted of cycads during the triassic period? 100% 75% 50% 20%