Give reasons for the following statement.
One side of the iron girdles of the bridge are placed on rollers.
Give reasons for the following:
a) Iron is used to construct bridges and houses.
b) Iron sheets are galvanized before use.
Give reasons for the following statement -
Existence of life on earth Is based on carbon compounds.
Aluminium wire and iron nails change shape when hammered.
Choose the odd one out. Give reasons for your choice.
carbon, sulfur, hydrogen, iron