The diagram below shows a model of the Earth's orbit around the Sun. Positions I, II, III, and IV represents Earth's position at the beginning of
each season.

Between which two positions does the Earth's Northern Hemisphere move
from Summer to Fall/Autumn?

I and III

II and III

IV and II

I and IV

I would say that I and IV because summer is I and fall is IV

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.