Natural Science Passages

• Identify the main scientific concept or finding being discussed, including findings given as data in the prose
• Follow the logical structure of a scientific argument or process
• Answer detail and cause-and-effect questions by finding the line that states them, scanning for scientific terms and definitions
• Vocabulary in context: predict your own word for the blank, then pick the choice that matches how the word is used in that sentence
• Finish on one ACT-hard question and say what made it hard

The natural science passage discusses a scientific topic such as biology, chemistry, physics, ecology, or astronomy. On the enhanced ACT it is labeled informational, and it is the passage most likely to come with a table or graph (the Charts and Tables lesson teaches those questions). You do not need prior science knowledge; everything you need is in the passage. These passages tend to be densely packed with facts, processes, and technical terms, so many students find them the hardest to read quickly. The key is to understand the overall framework (what is being studied and why) rather than memorizing every detail. Questions often ask about specific facts, cause-and-effect chains, or the significance of a finding mentioned in the passage. Vocabulary in context questions give you a word or phrase and ask what it means in a specific sentence. The ACT favors common words with secondary meanings: 'grave' (serious), 'check' (restrain), 'sound' (reliable). Cover the word, read the sentence, predict your own replacement, then choose the option closest to your prediction and substitute it back into the sentence to confirm it makes sense. Keep a few-word gist after each chunk (what is being studied, what was found, what it means). When a sentence or a question stem is dense, decode it into plain words, find the line that answers it, then pick the choice that paraphrases that line. Proof habit: before locking any answer, point to the line that supports it; if no line does, the choice is out. At the hard end, one strong word in the passage seems to back an extreme choice, and the surrounding sentences show the real, narrower meaning, so read the lines around a loaded word before trusting it.

• Don't panic over unfamiliar scientific terms. The passage will define or contextualize them.
• Skim for structure on first read: introduction of the topic → explanation of the process → results or implications.
• For detail questions, the answer is almost always a paraphrase of something stated directly in the passage.