Question

1. which of hte following would be an example of an uncontrolled experiment?

the effect of salt and water being mixed at different temperatures.
the effect of the jet streams on weather conditions.
the effect of heat on a plants growth.
the effect of water on different metals in a lab.

Explanation:

An uncontrolled experiment is one where variables can't be easily controlled or manipulated. For the effect of jet streams on weather, jet streams and weather conditions are large - scale, natural phenomena with many uncontrollable factors (like other atmospheric conditions, geographical features affecting weather, etc.). In contrast, mixing salt and water at different temps, effect of heat on plant growth, and effect of water on metals in a lab can be controlled in a laboratory setting by manipulating variables (temperature, heat, type of metal/water amount etc.).

Answer:

The effect of the jet streams on weather conditions.