Multiple choice general knowledge

The Earth is surrounded by an insulating layer of gases which protects it from the light and heat of the Sun. This insulating layer is called the:

  1. Hydrosphere

  2. Biosphere

  3. Lithosphere

  4. Atmosphere
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The atmosphere is the gaseous layer surrounding Earth, composed mainly of nitrogen and oxygen. While the question stem contains an error (the atmosphere doesn't protect FROM light and heat - it moderates temperature and allows sunlight through), 'Atmosphere' is still the correct answer among the given options. The other options refer to Earth's other major spheres: hydrosphere (water), biosphere (living organisms), and lithosphere (Earth's crust).

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