'across activity' is correct and usable in written English.
You can use it to describe something that happens in multiple different activities or areas. For example: "The changes we made in the strategy have had a positive impact across activity."
A comparison across activity types and social interaction types is made among spatial patterns during a day.
One condition is that he should have come across activity that was actually illegal (he didn't: he saw stuff he didn't like, and worried about where it was heading).
Among women, collapsed across activity, increase in heart rate correlated with memory accuracy.
Injuries occur to participants of all fitness activities, but the pattern of injury differs across activity types.
Among women, collapsed across activity, memory performance exhibited a slight positive relationship with change in heart rate, but this was not significant.
Once routers are processing metadata about endpoints across activity streams, there will be an economic rationale for consolidating access to such metadata globally, and therefore infrastructure, services, and network effects benefits for the user to do so.
This information could then be used for regulatory read-across activities (Patlewicz et al. 2014).
That is, the design process involves many iterations across activities.
In the person condition, each doll acted consistently across activities, but differently from each other.
A multiple probe design across activities was used to analyze intervention effectiveness.
Instead of nine projects, they settled on just two, which drove alignment across activities as well as accountability for them.
