A lake is part of the .

Water vapor in the air is part of the
.

Glaciers and icebergs are part of the
.

The Rocky Mountains are part of the
.

A deer is part of the
.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

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