The phrase "activity that seems to" is correct and usable in written English.
It can be used when describing an action or behavior that gives the impression of something, often implying uncertainty or subjectivity.
Example: "The activity that seems to engage the students the most is the hands-on experiments in the lab."
Alternatives: "action that appears to" or "task that looks like".
(And considering the disappointing performance of Saw VI and the success of Paranormal Activity, that seems to be the case).
I'm not sure how you could get below the surface of a ritualistic party activity that seems to only exist on the surface: being watched, being desired and yet being detached from those things at the same time through drugs and alcohol.
About 2500 bce there was a sudden burst of activity that seems to have had clear scientific importance.
This really is something you can only experience in Vietnam, but is an activity that seems to get overlooked by many visitors.
Danckert is hoping to find out whether boredom is connected to a phenomenon called the "default network" — a background hum of brain activity that seems to remain on even when you aren't directly focused on something.
"After years of people complaining about kids today being house-bound and becoming fat loads on the couch, we have the scooter, which is a tremendous physical activity that seems to have gotten kids out of the house," Mr. Gillespie said.
The committee told OSSE to do whatever is necessary to encourage school employees to report any activities that seemed to compromise test security.
For most of the children, whether from families that supported the Syrian regime or those trying to flee it, their daily rituals were the activities that seemed to bring a very abnormal way of life back to something more familiar.
Living in north London you get used to the periodic disturbances of sleep by the fox population in the midst of the two activities that seem to occupy their nights: fighting and breeding.
