Part A ph hothe wounge ear of Eamhis Netary 8.4 8.1 8.0 7.9 0 -10 Time (millions

Question

Part A ph hothe wounge ear of Eamhis Netary 8.4 8.1 8.0 7.9 0 -10 Time (millions of years before the present) 25 20 15 t, Lewis and Wallace, 2006. Carbon Dioxide Information Analysis Center. ORNL. US DOE. Oak Source: Acidification Model Source CO2SYS (Pierrot Ridge. TN, USA) What can be conctuded from the graph? Select all that apply. Ocean acidity has been steadily decreasing from 20 million years ago to the present time. In the last 20 million years of Earth's history, the average ph has never gone below 8.0. Average ocean pH has fluctuated over the millennia from just over 8.0 to about 8.3 Ocean acidity has been steadily increasing from 20 milion years ago to the presen

Explanation / Answer

Part A.

Option 2 and 3 can be concluded from graph

-in last 20 million years of earth history, average ph has never gone below 8.

-average ocean ph has fluctuated over the millenia from just over 8 to 8.3

#mass no

Mass no=no of proton+no of neutron

As 109 neutrons present means 109 protons are there

So 109+157=266 but atom has +1charge which means additional 1 proton present. So total atomic mass=267

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