Which of these is not a reason why the geocentric model of the solar system was once commonly accepted as the correct model? a. the sun and moon appear to orbit earth. b. earth rotates on its axis once every 24 hours. c. the planets and some stars appear to orbit earth. d. earth seems firm and does not feel like it is moving.

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.

Some type of thing that was invisible