Question

which of the following describes a closed system? a waves splashing on the shoreline, forming puddles b sunlight falling on the leaves of a sunflower c a rock thrown into the sky d snow falling on the ground and then melting

Explanation:

A closed - system is one that exchanges energy but not matter with its surroundings. A rock thrown into the sky is a closed - system as it exchanges kinetic and potential energy with its surroundings but no matter is transferred in or out of the system. In option A, water is exchanged with the environment as waves splash and form puddles. In option B, sunlight is an energy input and photosynthesis may cause some gas exchange (matter exchange). In option D, snow melting involves a phase change and interaction with the environment which can be considered as matter and energy exchange in a more complex way.

Answer:

C. a rock thrown into the sky