Updated 2026-08-23easy

TOEFL Reading Practice #001 — The Quicksand That Won't Swallow You

Free TOEFL Reading practice: The Quicksand That Won't Swallow You. 11 questions with a full passage and answer key.

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How to use this practice: Read the passage once without a dictionary, then answer the questions on your own. Tap “Answer” under each question to reveal just the correct letter — no explanations, so you can keep testing yourself.
1

Passage

Read the full passage. Bracketed letters like [A] mark the four positions for the insert-text question.

The Quicksand That Won't Swallow You

¶1 Quicksand has a fearsome reputation that its real behavior does not fully support. In movies, a character in quicksand sinks lower and lower. Only a hand is left above the surface. This image convinces many people that quicksand can swallow someone whole. Water closes completely over a dropped stone, and people assume sand does too. Real quicksand forms only in a few wet places, such as riverbanks and beaches. There, sand and water happen to mix in a certain way.

¶2 Ordinary dry sand supports weight because its grains press tightly against one another. The friction between them locks the pile into something almost solid. Quicksand forms when water fills every gap between the grains and pushes upward, often from a spring or tide. The water pushes the grains apart until they stop pressing against each other. Once that contact is lost, the mixture starts behaving like a thick liquid. Scientists call this change liquefaction. A footstep alone can cause it.

¶3 This mechanism explains why people get stuck in quicksand. But it does not explain the complete sinking that movies show. [A] Quicksand is denser than a human body, much like thick mud is denser than wood. [B] Because liquefied sand pushes back harder than plain water does, a person's body stops sinking once its weight is balanced by that push, usually around the waist. [C] It works much like how a swimmer floats more easily in the Dead Sea than in a pool. [D] In 2005, a team of physicists confirmed the pattern by shaking sand and water in a lab. Their measurements matched reports from people who had been stuck.

¶4 The real risk is different from what movies suggest. Struggling makes matters worse. Fast movements loosen the sand, but only briefly. Once a limb stops moving, the sand settles again and grips it like wet concrete. People who lean back, spread their weight, and move slowly can usually work a leg free. It takes only a few minutes. The greater danger comes from where quicksand tends to form. Rising water nearby can turn a stuck leg into an emergency. Quicksand does not swallow anyone whole. It simply does not let go easily.

  • liquefaction: the process of solid, packed ground turning into a liquid-like mixture
  • denser: heavier for the same amount of space
2

Questions

11 questions — every TOEFL Reading question type, in test order.

Q1 · Vocabulary
The word fearsome in paragraph 1 is closest in meaning to
  1. A. very frightening
  2. B. very rare
  3. C. very old
  4. D. very useful
Answer
Correct: A
Q2 · Reference
The word it in paragraph 2 ("A footstep alone can cause it") refers to
  1. A. the underground spring
  2. B. the grains
  3. C. liquefaction
  4. D. a rising tide
Answer
Correct: C
Q3 · Essential Term
Based on the information in the passage, the term liquefaction can best be explained as
  1. A. the process of a gas cooling down until it becomes a liquid
  2. B. the change of packed, wet sand into a liquid-like mixture once its grains stop pressing against each other
  3. C. the weight of a footstep pressing down on top of dry sand
  4. D. the packing of loose sand grains into a solid, sand-castle-like block
Answer
Correct: B
Q4 · Factual Information
According to paragraph 2, why do the sand grains in quicksand stop pressing against each other?
  1. A. Because the grains are unusually smooth and slide past each other easily
  2. B. Because water fills the gaps between the grains and pushes them apart
  3. C. Because footsteps grind the grains down into smaller pieces
  4. D. Because the tide carries the sand grains away entirely
Answer
Correct: B
Q5 · Negative Fact
According to paragraph 1, all of the following are true of quicksand EXCEPT
  1. A. Its reputation for danger is scarier than how it actually behaves
  2. B. In movies, a person is shown sinking until only a hand is left above the surface
  3. C. It can be found in many different kinds of dry environments
  4. D. It forms when sand and water combine in a particular way
Answer
Correct: C
Q6 · Sentence Simplification
Which of the sentences below best expresses the essential information in the highlighted sentence in paragraph 3? Incorrect choices change the meaning in important ways or leave out essential information.

Highlighted: "Because liquefied sand pushes back harder than plain water does, a person's body stops sinking once its weight is balanced by that push, usually around the waist."
  1. A. Liquefied sand resists more than water does, so a sinking body stops around waist level once the forces balance.
  2. B. Sand and water push back with exactly the same force, so people always sink down to the waist.
  3. C. A person's body pushes against the sand until it reaches waist level, and this is what turns the sand into a liquid.
  4. D. Liquefied sand pushes back harder than water only when a person struggles, stopping the sinking exactly at the knees.
Answer
Correct: A
Q7 · Inference
Based on the information in paragraph 3, what can be inferred about why a swimmer floats more easily in the Dead Sea than in an ordinary pool?
  1. A. The water in the Dead Sea likely pushes back harder against a floating body than ordinary pool water does
  2. B. The Dead Sea is warmer than an ordinary pool, which helps swimmers float
  3. C. The passage states that the Dead Sea contains large amounts of sand
  4. D. Swimmers actually float less easily in the Dead Sea once their body reaches waist level
Answer
Correct: A
Q8 · Rhetorical Purpose
The author mentions the 2005 study by a team of physicists in order to
  1. A. explain how a person can escape from quicksand safely
  2. B. give scientific support for the density-based explanation given earlier in the paragraph
  3. C. compare quicksand and the Dead Sea in full detail
  4. D. describe how rising tides raise water levels
Answer
Correct: B
Q9 · Paragraph Relation
How does paragraph 4 relate to paragraph 3?
  1. A. It argues that the explanation given in paragraph 3 is incorrect
  2. B. It repeats the 2005 study from paragraph 3 in more detail
  3. C. It introduces a completely different cause of quicksand formation
  4. D. It shifts from why a person cannot sink completely to what the real danger of quicksand actually is
Answer
Correct: D
Q10 · Insert Text
Look at the four squares [■] in paragraph 3 that indicate where the following sentence could be added.

Scientists wanted to check this pattern directly, not just describe it.

Where would the sentence best fit?
  1. A. Square A
  2. B. Square B
  3. C. Square C
  4. D. Square D
Answer
Correct: D
Q11 · Prose Summary Select THREE · 2 pts
Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.

Quicksand forms through a process called liquefaction, but a person cannot sink into it completely because of a difference in density.

  1. A. In movies, a person who steps into quicksand is often shown sinking completely out of sight.
  2. B. Quicksand forms when water fills the gaps between sand grains and pushes them apart, turning the packed sand into a liquid-like mixture.
  3. C. Because quicksand is denser than a human body, a sinking person stops at a balance point, usually around the waist.
  4. D. In 2005, a team of physicists tested the density pattern by shaking sand and water together in a lab.
  5. E. Struggling in quicksand makes escape harder, while staying calm and moving slowly usually frees a stuck leg.
  6. F. Quicksand can only form in deserts where there is little rainfall.
Answer
Correct: B, C, E