ACT Science 3.4 Data Representation Passage
ACT Science: Data Representation Passage Drill 3, Problem 4. Which of the following best describes the change in atmospheric 14C after 1965?
|ACT Science||Data Representation Passage|
|Earth/Space Sciences||Environmental Science|
|Product Type||ACT Science|
We're looking for the figure that shows changes in amounts of carbon-14...so we're definitely
looking at figure 1.
The question says "after 1965." So let's start by locating 1965 on both curves.
Next, we'll notice that after 1965, both lines start sloping downwards.
That means the change in 14C is decreasing, not increasing.
We can rule out choices (C) and (D) because both say increase. Now, all we have to do
is decide whether the trends are decreasing linearly or exponentially.
Linear means in a straight line, but neither of those curves look straight to us.
That is, after all, the definition of a curve, right?
That means that the change must be declining exponentially!
The correct answer is (B).