• 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.