Question

why is a lake such as the one pictured considered an open system?
there are no interactions with other bodies of water.
there is an input and output of energy and water.
it is isolated by the mountains surrounding it.

Explanation:

An open system is defined as a system that exchanges both matter and energy with its surroundings. A lake receives water input (e.g., from rivers, rainfall) and has water output (e.g., via outflow, evaporation), while also exchanging energy (e.g., solar radiation, heat loss to the atmosphere). The other options describe closed/isolated systems, not open ones.

Answer:

There is an input and output of energy and water.