In Week 8 of Season 5 of Fortnite: Battle Royale, you need to use rifts at various rift spawn points. How to do this and where to find the rifts is explained here!
How to use the rifts: Rifts are nothing new in Season 5. The blue glowing anomalies spawn at certain locations. To use them for the challenge in Week 8 of Season 5, you just need to touch them. They will then beam you up to the sky, and you can glide back down.
What about fall damage? Unlike usual in the game, you don’t take fall damage when coming from the rifts. The parachute does not automatically deploy; you need to activate it manually if you want to glide.
Where are the various rifts and spawn points?
How to find the rifts: Rifts usually appear in greater numbers at their spawn points. You can find these locations on the pictured map.

More info on the rifts in Week 8 of Season 5
Do the rifts always appear? Unfortunately no, sometimes there are no rifts available, or they appear later or disappear again.
Where can I find the most rifts? You have the best chance of completing the challenge if you glide to the southeastern desert area of Paradise Palms. There, you can find about half of the currently known 22 rift spawns.
How to get many rifts in a row: If you want to complete the challenge as quickly as possible, land at one of the edges of Paradise Palms at a rift location. Take it, and then glide to the next location from the air. Keep doing this until you can no longer find rifts or someone takes you out.
It must be 10 different locations: Also, keep in mind that you can’t just mindlessly farm any rifts over and over. Each rift location can only be used once for the challenge. Even if multiple rifts appear at one location, only one counts.
Do I have to visit all the rifts in the same match? Fortunately not. You can complete the 10 rifts in as many matches as you like.
Watch out for tryhards: As always, there are a few unpleasant individuals who want to secure kills and will ruthlessly take you out when you want to complete this challenge. So be careful to be alone, or take out all the players in the area first.
That’s all about our rift spawn points. Have you found any other locations?
