The following graph shows the average pH of the ocean over the last 20 million years of Earth's history. 8.4 8.3 8.2- 8.1 8.0 7.9- -15 -10 -5 Time (millions of years before the present) Source: Acidification Model Source CO2SYS (Pierrot, Lewis and Wallace. 2006. Carbon Dioxide Information Analysis Center, ORNL, US DOE, Oak Ridge, TN, USA) What can be concluded from the graph? Select all that apply. -25 -20 0 5 Ocean acidity has been steadily increasing from 20 million years ago to the present time. Average ocean pH has fluctuated over the millennia from just over 8.0 to about 8.3. In the last 20 million years of Earth's history, the average pH has never gone below 8.0. Ocean acidity has been steadily decreasing from 20 million years ago to the present time.

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Physical and Chemical features

The physical property of a compound could be determined without modifying the originality of the compound. Examples of physical properties are density, hardness, color, boiling, and melting point. The chemical property expresses the ability of a compound to undergo a particular chemical change.