Which planet is described as having the biggest atmosphere among terrestrial planets?

Prepare for the Pre-IB Grade 9 Science Exam with detailed flashcards and multiple-choice questions. Each question is paired with hints and thorough explanations. Ace your test with confidence!

Multiple Choice

Which planet is described as having the biggest atmosphere among terrestrial planets?

Explanation:
Think about what “biggest atmosphere” means in practical terms: the amount of gas surrounding the planet, which shows up as surface pressure and atmospheric mass. Venus has a wildly thick atmosphere composed mainly of carbon dioxide, producing a surface pressure about 92 times that of Earth. That enormous layer makes Venus’ atmosphere the heaviest and most substantial among rocky planets. Mercury almost has no atmosphere because its gravity is too weak and the solar wind blows gases away; Mars has only a thin CO2 blanket; Earth has a sizable atmosphere, but not nearly as dense as Venus’s. So Venus stands out as having the largest atmosphere among terrestrial planets.

Think about what “biggest atmosphere” means in practical terms: the amount of gas surrounding the planet, which shows up as surface pressure and atmospheric mass. Venus has a wildly thick atmosphere composed mainly of carbon dioxide, producing a surface pressure about 92 times that of Earth. That enormous layer makes Venus’ atmosphere the heaviest and most substantial among rocky planets. Mercury almost has no atmosphere because its gravity is too weak and the solar wind blows gases away; Mars has only a thin CO2 blanket; Earth has a sizable atmosphere, but not nearly as dense as Venus’s. So Venus stands out as having the largest atmosphere among terrestrial planets.

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