ACT Science

SAT Question of the Day

The SAT question of the day is a Coordinate Geometry Question that has already been addressed on this blog: click here to see an explanation.

ACT Question of the Day

The ACT question of the day is a science question that tests your ability to read a table and identify a trend in the data.

Look first at the question.  You want to predict the pH of sediments at a depth of 35 cm.  Look at the table.  The table only goes to a depth of 20 cm.  The table also lists depths in increments of 5.  That means that 35 will not be the next value on the chart.  You can add the next three depths up to 35 cm at the bottom of the chart, leaving a space for 25, 30, and 35.

Now look at the pH of the sediments in the table.  At 0 cm, the pH is 7.  At 5 cm, the pH is 6.5.  That means that for every 5 cm, the pH decreases by .5.  This pattern continues in the table, all the way to a depth of 20 cm.  At 20 cm, the pH is 5.  If you take away .5, then at 25 cm the pH will be 4.5.  What will the pH be at a depth of 30 cm?  It will be 4.  What about a depth of 35 cm?  The pH will be 3.5.  This is the answer to the question!

The correct answer is (B).

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