碳
=
炭
+
石
:
Tecumseh (t) further processes the charcoal (炭) he made in the anthill's bathroom (an4) into pure carbon (碳) by crushing the charcoal (炭) into its elements and exerting extreme pressure with a rock (石).
汇
=
匚
+
氵
:
Helga Horse (hu) brought a collection (汇) of water bottles (氵) and a metal box (匚) to the Eiffel Tower's bathroom (ei4). Each bottle contains water from a different river. Finally the moment she's been waiting for arrives: As she empties each bottle into the metal box, she converges (汇) the water of all these rivers at once.