The Survivability of Random Locations
How common are locations where you could survive?
Suppose someone offers to teleport you to a randomly selected location. Don't acccept that offer without making strict conditions, or you will almost certainly die horribly in a randomly selected location.
1) If a human was magically teleported to a randomly selected location in the universe, the odds would be gazillions to one that they would die almost instantly. The vast majority of the universe's volume is the vacuum of outer space. I have never calculated the proportion of the universe's volume which is within the biospheres of various habitable planets, but it is extremely and incredibly tiny.
2) It would be much safer for a human to be teleported to a rendomly chosen location at the planet Earth, or any planet known to be habitable for humans. However, the human would still have only a very, very, very small chance of surviving. The biosphere of Earth where life can survive is an extremely thin shell; the vast majority of the volume of Earth is densely packed rock beneath the biosphere.
3) It would be much safer for a human to be teleported to a randomly chosesn location within the biosphere of Earth, the part of Earth where various lifeforms live. But even in that case the human would probably die, since humans can not survive in most of the biosphere of Earth. The biosphere extends several kilometers or miles high into the atmosphere and several kilometers or miles deep beneath the oceans and deep within the rocks of Earth's crust.
4) It would be much safer for a human to be teleported to a randomly selected spot on the surface of the Earth. However, the majority of the surface of the planet Earth is ocean surface out of sight of land and too far for a human to swim to shore before drowning.
5) It would be much safer for a human to be teleported to a rendomly selected spot on the land surface of the Earth. However, large parts of the land surface of planet Earth are too hostile for a human to survive more than a few days or even hours without the right clothing and sufficient supplies of water and food and knowledge of which way to go to reach a more hospitable location.
And of course if someone offered to send you to an alternate or parellel universe where the laws of science were different, the odds of ending up in a habitable location would probably be even more infinitesimal than in our universe.
What does that have to do with Wizards of Waverly Place?
In the third season episode "Third Wheel", (April 30, 2010). Harper tells Alex Russo that Stephanie "Stevie" Nichols, a new girl at school, is a wizard like Alex. When they ask Stevie she admits it and demonstrates her magic by causing a portal to somewhere else to appear beneath the feet of a passing student who plunges into it.
Alex askes Stevie where she sent the boy, and Stevie says she doesn't know. Alex says that's the kind of irresponsible magic she approves of and she and Stevie bond with each other, making Harper fear that Stevie is a threat her friendship with Alex.
When the boy disappears into the portal beneath his feet, Harper says something like "Oh no! that was Jeremy from science. He was going to ask me to the dance next week." But she doesn't say or do anything else about Jeremy like asking the girl wizards to reverse the spell & bring jeremy back.
Stevie says she doesn't know where she sent Jeremy to, so she can't know whether it is safe or lethal for humans. But as said above, the odds are astronomically high that any randomly chosen location will be lethal to a human sent there.
Alex doesn't ask Stevie to return Jeremy to the school and doesn't try to bring Jeremy back herself.
Continued.