Yes correct.
It will make the sentence more clear and understandable.
No, it is not grammatically correct. "Such a" can only be followed by a base-form adjective, like "large." If you want to make a comparative sentence, you might say, "Why do meteors have a MUCH larger impact on the Earth THAN on the moon."
A compound subject for impact would have to be two words that are subjects in the beginning of the sentence and the word impact would have to be in the sentence somewhere.
EVERYONE!!!!!!!!! EVERYONE CAUSE THERE IS NO MORE OF THEM!!!!!!!!!!!!!!!!!!!!
may be i dont know.. !
Our regional measures have had a significant impact on unemployment.
he opened trade routes for explorers.
The subject should be singular, problem, to agree with the verb has, or the verb should be have, not has, to be in agreement with the plural subject, problems.
Brace for impact - we'regoing in!Please hand me that impact wrench.
The meteoroid collided with a devastating impact.
Greenhouse gases have had a significant impact on the environment.
The baseball collided with his face with such an impact, that it broke his nose.