Common Core LiteracyGrades 11–12Science & Technical

RST.11-12.10: Reading Dense Science on Your Own

Also written as CCSS.ELA-LITERACY.RST.11-12.10 · Cluster: Range of Reading and Level of Text Complexity.

Get the Cornell Notes All 29 Grades 11–12 Literacy Standards

The Official Wording

By the end of grade 12, read and comprehend science/technical texts in the grades 11-CCR text complexity band independently and proficiently.

Common Core State Standards, Grades 11-12, Reading: Science & Technical Subjects · Read it at the source · Checked October 14, 2026

What RST.11-12.10 Means in Plain English

Juniors and seniors read science and technical texts at the top of the high school range on their own: long sentences, terms defined in passing, ideas that stack. A passage on why the Sun’s protons fuse at all tests all three, with a paradox resolved by quantum tunneling.

Ninth and tenth grade (RST.9-10.10) reached independence in the grades 9-10 band by the end of grade 10. Grades 11-12 raise the level to the grades 11 to college band. This is the last band of the line, the science reading expected of graduates ready for college and careers.

RST.11-12.10 I Can Statements

I can follow a long science sentence to its main point.
I can keep track of terms a text defines in passing.
I can read a dense science passage alone and explain it.

RST.11-12.10 Worked Example

The passage is written for this page, and its physics is real. The weak answer catches the topic but misses the paradox the whole passage turns on.

Read the Story

At the center of the Sun, hydrogen nuclei, which are single protons, are packed more than a hundred times as densely as water and heated to about 15 million kelvins, yet by the rules of classical physics they should almost never fuse.Two protons, both positively charged, repel each other with a force that grows as they approach, and a typical proton in the core carries well under one percent of the energy needed to climb this electrical barrier, called the Coulomb barrier, to the point where the strong nuclear force, which binds nuclei but reaches only about the width of a proton, can take hold.Quantum mechanics resolves the paradox: because a proton behaves partly as a wave, it has a small but real chance of turning up on the far side of the barrier without ever having had the energy to cross it, a process called tunneling.Even then, fusion requires that one of the two protons turn into a neutron during the brief encounter, an event governed by the weak nuclear force and rarer still, so the average proton in the core waits billions of years before it fuses; that slowness, far from a flaw, is what has let the Sun shine steadily for some 4.6 billion years instead of spending its fuel in a single flash.

A short passage written for this page.

Question: Read the passage on your own first. What paradox does it set up, how does it resolve it, and why does the author call the Sun’s slow fusion “far from a flaw”?

Not Yet“The Sun is very hot, so protons crash together and fuse, which makes the Sun’s energy. Tunneling is how the protons get through. The Sun is slow because it is very big.”It skips the paradox, that the core is too cool for fusion by classical rules, and so misses why tunneling matters at all. The last sentence invents a cause the passage never gives, a sign the long final sentence was not untangled.

Meets the Standard“The paradox is that the Sun’s core, at about 15 million kelvins, is not hot enough for protons to fuse by classical rules: a typical proton carries well under one percent of the energy needed to get over the Coulomb barrier, the electrical repulsion between two positive charges, to where the strong force can bind them. Quantum mechanics resolves it, since a proton acts partly as a wave and can tunnel through the barrier without the energy to climb it. Even then, one proton must turn into a neutron during the encounter, a rare weak-force event, so the average proton waits billions of years. The author calls that slowness ‘far from a flaw’ because if fusion were easy, the Sun would have spent its hydrogen in a flash instead of shining for 4.6 billion years.”It finds the paradox the first sentence sets up with “yet,” follows the long second sentence to its point, keeps the two obstacles distinct, and explains the closing reversal, which is the independent reading of dense science this standard expects.

Question Stems to Use

What does the word yet signal in the first sentence?What is the main clause of the longest sentence? What do the inserted phrases add?How many separate obstacles to fusion does the passage describe?Which terms does the passage define as it goes, and where?Which sentence did you reread, and what finally made it clear?

Common Mistakes with RST.11-12.10

Skipping the setup of a paradox

“The Sun is hot, so the protons fuse.”

Try this: Have students find the contrast word in the first sentence and state, in their own words, what should happen and what actually does.

Merging two separate ideas into one

“Tunneling is why the Sun burns slowly.”

Try this: Ask students to list each obstacle the passage names and how it affects fusion, then check that their summary keeps them separate.

Supports that never come off

A senior class that gets a glossary, a diagram and a summary before every reading

Try this: Remove one support each quarter, and by senior spring hand students the text with nothing but the question attached.

Where RST.11-12.10 Fits

Comes BeforeRST.9-10.10Read science and technical texts in the grades 9-10 band independently by the end of grade 10.

AlongsideRI.11-12.10Read literary nonfiction at the same level, moving from support in grade 11 to independence.RH.11-12.10Read history and social studies texts at the grades 11 to college level independently.

Comes NextWHST.11-12.10Write routinely about science texts, from quick responses to work revised over weeks.

Practice RST.11-12.10

Fill-in-the-Blank GeneratorFree ToolPaste a dense science passage and blank its key terms, so students must rebuild the argument from the sentences around each gap.Paste a passageGrades 11-12Key terms

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Quick Check

Why shouldn’t protons in the Sun’s core fuse, by classical rules?
A typical proton carries well under one percent of the energy needed to get over the Coulomb barrier, the repulsion between two positive charges.
How does tunneling resolve the paradox?
Because a proton acts partly as a wave, it has a small chance of turning up past the barrier without the energy to climb it.
Why does the author call the slowness of fusion “far from a flaw”?
Slow fusion is what has let the Sun shine steadily for about 4.6 billion years instead of using up its fuel at once.

RST.11-12.10: Other Names

RST.11-12.10CCSS.ELA-LITERACY.RST.11-12.10