Question

Earth and all of the air in the atmosphere around it make up an incredibly complex system. Energy is constantly changing forms in many different ways.

How would scientists most likely describe the system of the Earth in regard to energy?

Earth is an isolated closed system because energy only escapes the system as heat travels into space.
Earth is an isolated closed system because the atmosphere allows energy from the Sun to enter as heat.
Earth is an open system because the atmosphere stops energy from escaping into space.
Earth is an open system because heat energy from the Sun enters through the atmosphere.

Answer 1

Earth is an open system because heat energy from the Sun enters through the atmosphere.

Explanation: energy (solar radiation) continuously flows into Earth and outgoing infrared radiation leaves to space, so energy is exchanged with the surroundings rather than being isolated.