ACT Science · Study Guide
Science Foundations
Learn to read and interpret the graphs, tables, and charts that form the backbone of ACT Science passages. The Science section is now optional but still valuable for many college applications.
About 40 minutes to master
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What you'll learn
- Read and interpret line graphs, bar charts, scatter plots, and data tables
- Identify independent and dependent variables in experiments
- Recognize trends, direct relationships, and inverse relationships in data
- Extract specific data points from complex figures quickly
Key concepts
ACT Science questions primarily test your ability to interpret data rather than recall scientific facts. Data Representation passages present graphs, tables, or figures and ask you to read values, identify trends, and make predictions. When reading a graph, always check the axis labels and units first. A direct (positive) relationship means both variables increase together; an inverse (negative) relationship means one increases while the other decreases. About 30-40% of Science questions are pure data lookup. Free points if you read carefully.
Pro tips
- Read the axis labels and units before looking at the data. Many wrong answers simply switch units.
- Use your finger or pencil to trace along graph lines to find exact intersection points.
- You do not need to read the full passage text first; go straight to the questions and refer back to the figures as needed.
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