Multiple choice

Earth is considered a system because all of its parts ____

  1. were formed at the same time

  2. are powered by the same energy source

  3. interact

  4. represent separate closed systems
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A system is defined as a group of interacting parts that function as a whole. Earth is a system because its various spheres (geosphere, hydrosphere, atmosphere, biosphere) constantly exchange matter and energy.

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