The acidity of a substance relates to the proportion of free hydrogen ions (H+) it contains. Acidity is measured on a logarithmic scale. Even a small decrease in pH of ocean water can cause a large increase in hydrogen ions and acidity. This increase can have grave effects on marine ecosystems. For the last 300 million years, the average pH of the oceans has been 8.2. Today, the average pH is 8.1. Using the hydrogen ion concentrations, what is the percent increase in acidity of the ocean in the past compared to today?

[fw.02]diana is studying four surface features of florida. she classifies the surface features and places them in different columns of a chart as shown below. surface features column 1 column 2 hot springs sinkholes caverns geysers which of these titles best represents column 1 of diana's chart? formed by freezing groundwater o formed by heating groundwater o formed by evaporation of groundwater o formed by chemical action of groundwater

Look at the data above. provide an explanation for europe’s projected population decrease by the year 2050. (i'm doing this for future kids) the answer is : the percentage of people over the age of 65 and under the age of 15 in europe is currently the same at 16% each. therefore, the majority of the population is between the ages of 16 and 64. in forty years from now, in 2050, a greater percentage of the population will be over the age of 65. europe also has a relatively long life expectancy of 75 years. this, combined with a low birth rate means that by 2050 europe’s population will actually be less than it is today.

Which of the following is true of judaism? a-judaism is the predominant religion of eastern europe b-judaism is the root religion of both christianity and islam c-judaism emerged from christian tradition d-judaism originated in europe