Questions: Climate change can be defined as the movement of the temperature of the planet up or down over time

The answer is the first one: the movement of the temperature of the planet up or down over time.

Explanation for each option:

1. The movement of the temperature of the planet up or down over time: This is the correct definition of climate change. Climate change refers to significant changes in global temperatures and weather patterns over time. While recent discussions often focus on global warming (the upward movement of temperatures), climate change encompasses both warming and cooling trends.

2. The movement of the temperature of the planet downward over time: This option is incorrect because it only considers a decrease in temperature. Climate change includes both increases and decreases in temperature.

3. Lack of temperature change in the planet over time: This option is incorrect because it describes a stable climate, which is the opposite of climate change. Climate change involves significant changes in temperature.

4. Movement upward of the temperature of the planet over time: This option is partially correct but incomplete. It only addresses global warming, which is a subset of climate change. Climate change also includes cooling trends.

Summary: Climate change refers to the movement of the temperature of the planet up or down over time, encompassing both warming and cooling trends.