The third snap (destroying the stones) didn't happen on Earth actually, it took place on... 0259? That planet Rocket and Nebula found him on, The Garden, not sure it had a real name.
There were still three snaps on Earth, though:
1.) Thanos snaps and erases half of all life.
2.) The Hulk snaps and restores half of all life.
3.) Iron Man snaps and erases Thanos and his army.