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AP Environmental Science Practice Quiz: Atmospheric $ ext{CO}_{2}$ and Particulates

Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026

Test your understanding with short quizzes. This quiz has 9 questions to check your progress.

Question 1 of 9

According to the provided text, which of the following is explicitly listed as a natural source of atmospheric CO₂?

All Questions (9)

According to the provided text, which of the following is explicitly listed as a natural source of atmospheric CO₂?

A) Photosynthesis

B) Industrial emissions

C) Respiration

D) Soil erosion

Correct Answer: C

The text states that CO₂ appears naturally in the atmosphere from sources such as respiration, decomposition, and volcanic eruptions.

Based on the information given, which of the following pairs are both identified as natural sources of atmospheric CO₂?

A) Respiration and fossil fuel combustion

B) Decomposition and volcanic eruptions

C) Volcanic eruptions and deforestation

D) Decomposition and photosynthesis

Correct Answer: B

The text explicitly lists decomposition and volcanic eruptions as natural sources of CO₂. Other options include anthropogenic sources or processes that consume CO₂.

What does the provided text state about the natural sources of particulate matter?

A) They are identical to the sources of CO₂.

B) They are limited to volcanic eruptions.

C) There are no natural sources of particulate matter.

D) There are a variety of natural sources.

Correct Answer: D

The text directly states, 'There are a variety of natural sources of particulate matter,' without providing specific examples.

The text lists several natural sources of atmospheric CO₂. Which of the following is NOT mentioned as a natural source in the provided content?

A) Decomposition

B) Respiration

C) Volcanic eruptions

D) Ocean-atmosphere exchange

Correct Answer: D

The text specifically mentions respiration, decomposition, and volcanic eruptions. It does not mention ocean-atmosphere exchange.

A key difference in the description of CO₂ and particulate sources in the text is that:

A) Only CO₂ is described as having natural sources.

B) Specific examples of natural CO₂ sources are given, while the description for particulate matter sources is general.

C) Particulate matter is described as having more natural sources than CO₂.

D) All listed CO₂ sources are biological, while all particulate matter sources are geological.

Correct Answer: B

The text provides a specific list (respiration, decomposition, volcanic eruptions) for CO₂ sources but only a general statement ('a variety of natural sources') for particulate matter.

A scientist studying a remote ecosystem observes CO₂ being released from the breakdown of dead plant material. According to the text, this process is an example of which natural source?

A) Respiration

B) Volcanic eruption

C) Decomposition

D) Particulate formation

Correct Answer: C

The breakdown of dead organic material is decomposition, which the text identifies as a natural source of atmospheric CO₂.

Which of the following phenomena is described in the text as a natural source for atmospheric CO₂ but not for particulate matter?

A) Volcanic eruptions

B) Respiration

C) Forest fires

D) Dust storms

Correct Answer: B

The text explicitly lists respiration as a natural source of CO₂. While volcanic eruptions are also listed for CO₂, they are a known source of particulates. The text does not link respiration to particulates, nor does it mention forest fires or dust storms.

Based ONLY on the provided text, which of the following conclusions can be drawn?

A) Volcanic eruptions release more CO₂ than decomposition.

B) There are at least three distinct types of natural CO₂ sources.

C) Sea salt is a major source of natural particulate matter.

D) Natural sources of CO₂ and particulates are the primary cause of climate change.

Correct Answer: B

The text explicitly names three distinct natural sources for CO₂: 'respiration, decomposition, and volcanic eruptions.' No information is given to support the other claims regarding the quantity of sources, specific types of particulates, or the cause of climate change.

A student claims that, based on the provided text, volcanic eruptions are a natural source of both CO₂ and particulate matter. Why is this claim not fully supported by the text?

A) The text states that volcanic eruptions only release particulate matter.

B) The text states that volcanic eruptions only release CO₂.

C) The text lists volcanic eruptions as a CO₂ source but does not provide any specific examples of particulate matter sources.

D) The text explicitly denies any link between volcanic eruptions and atmospheric pollutants.

Correct Answer: C

The text explicitly identifies volcanic eruptions as a source of CO₂. However, for particulate matter, it only makes the general statement that there is 'a variety of natural sources' without linking any specific source, including volcanoes, to it. Therefore, the claim is not fully supported by the provided content.