происходящий

• The geologic processes at work (or operating) today can be best understood by ... .

• This is not the only process going on in the collision.

• Proton transfer should be analyzed in terms of the specific change involved.

• We can observe vertical motion happening today.

• The developments (now) in progress (or under way, or taking place) indicate that ...

• This electrical activity is produced by the many electrified storms continuously in progress over the Earth.