Which factor has the most influence in earth's climate?

a. metal

b. landforms

c. interstates highways

d. crops

Crops. Well the earth climate is pretty unique due to the balance of substances in the atmosphere caused by the plant and also animal life on the planet. Or so I believe.

Landforms. This is because they can shift their structure, and they have an effect on where people live, (such as living on a plain or by a mountain). They change where people grow food, for example, you are less likely to grow food in a snowy place, rather than a plain.