What visual element would best show how the temperature of the earth has changed over the past 1000 years?

Graph

Explanation:

The graph is a visual element that would best show how the temperature of the earth has changed over the past 1000 years.

Graph often shows a pictorial method of representing data. This includes the representation of both data and values in a methodical way such as histograms, pie charts, bar charts, etc. It helps in determining the relationship between two or more points on the graph which is often represented accordingly.