ATMOSPHERIC SCIENCE

The atmosphere is the key to life on Earth. This thin layer is what protects us from the hostile environment of space. Here you can learn all about the atmospheric sciences.
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Why is it colder at the top of a mountain than it is at sea level?

Why is it colder at the top of a mountain than it is at sea level? Heat rises, and the top of a mountain is closer to the sun -- shouldn't it be hotter at the top of a mountain?

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  • Why does the sky get dark at night?

    Why does the sky get dark at night?

    Why does the sky get dark at night? Don't tell me it's just because the Earth rotates and the sun sets -- what I mean is, with all of its stars and other luminous bodies, why isn't the universe infinitely bright? See more »

  • Why is it colder at the top of a mountain than it is at sea level?

    Why is it colder at the top of a mountain than it is at sea level?

    Why is it colder at the top of a mountain than it is at sea level? Heat rises, and the top of a mountain is closer to the sun -- shouldn't it be hotter at the top of a mountain? See more »

  • Why is snow white?

    Why is snow white?

    Why is snow white? It's frozen water, and water isn't white, it's clear. See more »

  • Why is the sky blue?

    Why is the sky blue?

    Chances are you could formulate a reasonably well-informed guess. Why not read the article and get the definitive answer? See more »

  • Why is winter not happening?

    Why is winter not happening?

    Many folks in the Northern Hemisphere are still waiting for their full-blown snowman invasion to hit. Is Frosty ever going to come this winter? See more »

  • Will the U.S. be a desert in 50 years?

    Will the U.S. be a desert in 50 years?

    When climate variations mix with unsustainable agriculture and urbanization, vast swaths of once-fertile lands transform into deserts. Is the U.S. in danger of becoming a dried-up wasteland? See more »

  • 10 Countries With Perfect Climates

    10 Countries With Perfect Climates

    A perfect climate means different things to different people. These 10 countries span the globe and offer a wide range of climates to satisfy any taste -- hot, cold or in-between. See more »

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