Which of these statements are true?

[Select all that apply.]

Question

Which of these statements are true?

[Select all that apply.]

BlackTom AI · Accepted Answer

To tackle the question, I’ll evaluate each statement in turn and explain why it is true or false based on basic atmospheric science.
Option 1: 'Pressure increases as altitude increases' — This is false. As you move upward through the atmosphere, the weight of the air above you decreases, so the atmospheric pressure falls with altitude. In other words, pressure decreases roughly exponentially with height rather than increasing.
Option 2: 'Most of the visible light from the sun is absorbed by the atmosphere before it reaches earth' — This is also false. The atmosphere is largely transparent to visible light, which is why we see sunlight and daylight on the surface. Only a small fraction is absorbed or scattered; the bulk of visible light reaches the ground, with some absorption by ozone and scattering by air molecules causing phenomena like blue sky and sunsets.
Option 3: 'The regions of the atmosphere are named based on their temperature profile.' — This statement is true. The major atmospheric layers (troposphere, stratosphere, mesosphere, thermosphere) are defined and named largely according to how temperature changes with altitude in each region, not strictly by composition or other factors.
Option 4: 'More than 99% of the atmosphere is composed of N2 and O2.' — This statement is true. The vast majority of atmospheric mass is nitrogen (N2) and oxygen (O2), with these two gases together comprising over 99% of the air, while trace gases make up the remainder.

Which of these statements are true? [Select all that apply.]多项选择题

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