Yeah, that's a silly idea for a movie, but it does have potential (massive earthquakes destroying cities, damns bursting, the Golden Gate Bridge falling over, airplane landing on a runway that suddenly splits in two, dogs and cats living together, oceans boiling up gigantic clouds of steam, a volleyball game at a nudist colony is broken up by a sink hole with lava spurting out of it, etc.)...unfortunately none of that shit happens on screen. Why? Because half of the film it taken up with a love triangle between Andrews, his young wife and her scientist ex-boyfriend who she still has the hots for. Not a single motherfucker who paid to see a movie called Crack in the World(!!!) gave a single fuck about a love triangle, but it's an excuse to chew up runtime without spending money of special effects, so it what we got.
Insulting lack of action, weak ending, annoying screaming by the lead actress, magmanauts, mediocre acting, a guy with zero respect for helicopter blades, misleading tag line on the poster: "The day the Earth split in two!"...bullshit.
Based on the poster artwork, I was looking forward to seeing this movie. I was really curious as to how they were going to overcome the Earth splitting in two, but in the end, I just ended up disappointed and feeling sorry for Dana Andrews wasting his talents on this lying turkey.
Look how close that helicopter blade is to that guys dome!