Around 230 million years ago, the west coast of what is now Europe and the bulge of northwestern Africa began to collide slowly with the east coast of North America, (the comin together of the landmasses to form the supercontinent Pangea).
A. The coming together of the landmasses to form the supercontinent Pangea
B. The land masses coming together to form the supercontinent Pangea
Why is B right? Thanks
I don’t know if I’m able to explain this concisely or precisely, but let me illustrate with a simpler example:
Yesterday, Lucy and Sarah ran a 10k road race, the girls competing hard against each other every step.
Yesterday, Lucy and Sarah ran a 10k road race, the competition between the girls at every step.
The first sentence above is correct, and the second one is wrong.