Massachusetts Tests for Educator Licensure (MTEL) Practice Test

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What is the primary component of Mars' atmosphere?

  1. Oxygen

  2. Carbon Dioxide

  3. Nitrogen

  4. Hydrogen

The correct answer is: Carbon Dioxide

The primary component of Mars' atmosphere is carbon dioxide. Mars has a thin atmosphere, composed of about 95% carbon dioxide, which is significant for understanding the planet's climate and potential for past life. The high concentration of carbon dioxide contributes to the greenhouse effect, albeit a much weaker one than on Earth, impacting surface temperatures. In addition to carbon dioxide, Mars' atmosphere contains trace amounts of other gases, including nitrogen and argon, but these are present in much smaller quantities. The low levels of oxygen and hydrogen also highlight the distinct differences between Mars and Earth’s atmosphere, which is rich in nitrogen and oxygen. Understanding the composition of Mars’ atmosphere is crucial for scientists studying the planet's geology, climate, and potential for habitability.