Question detail

What role does percentage composition play in understanding atmospheric changes?

Try the question, check the answer, then read the explanation to understand the curriculum point.

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

The composition and evolution of the Earth's atmosphere

Question

A. It indicates the temperature of the atmosphere.
B. It helps track the evolution of life on Earth.
C. It shows how gas concentrations have varied over time.
D. It determines the pressure of the atmosphere.

Answer

The correct option is It shows how gas concentrations have varied over time.. This answer is correct because it matches the approved learning objective to explain why percentage composition is useful when describing atmospheric gases in the subtopic The proportions of different gases in the atmosphere.

Explanation

The correct option is It shows how gas concentrations have varied over time.. It shows how gas concentrations have varied over time. is correct because it directly supports the approved learning objective to explain why percentage composition is useful when describing atmospheric gases. This belongs to the subtopic The proportions of different gases in the atmosphere within The composition and evolution of the Earth's atmosphere, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from The proportions of different gases in the atmosphere.

Common mistake

Misunderstanding Percentage Composition

Students often confuse percentage composition with absolute amounts of gases, thinking it refers to the total volume rather than the proportion of each gas in the atmosphere.

Emphasize that percentage composition describes the relative proportions of each gas in the atmosphere, helping to understand the significance of each gas's presence.

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