Question

question 1
which of the following explains how earth is a system?
earth is the only planet with water.
earth has four spheres that are separate and independent components.
earth is in the boundary of the solar system.
earth has four spheres that interact with each other.

Explanation:

The Earth - system concept is based on the interaction of its four spheres (lithosphere, hydrosphere, atmosphere, and biosphere). These spheres are not independent but interact with one another, making Earth a complex system. The presence of water alone doesn't define Earth as a system. The spheres are not separate and independent, and Earth's position in the solar - system boundary doesn't explain it as a system.

Answer:

Earth has four spheres that interact with each other.