Oil, a complex mixture of hydrocarbons, takes millions of years to form naturally. Iron is a naturally occurring element, formed by fusion in the core of a star.
As far as humans need be concerned, iron is always present and oil is formed. If you must have one faster than the other, iron is formed faster than oil.
Salt water contains Na+ & Cl- ions which are highly reactive with iron to form FeCl2 .So iron rust faster in salt water.
iron travels faster
iron
Nails are made of iron, but pennies are copper and zinc. Iron reacts with oxygen to form rust, but copper on the outside of a penny does not.
iron rusts faster in presence of moisture and air.
Oil.
Iron
Iron will float in oil in most cases. However, for iron to float in oil, it must have a density which is lower than the oil.
iron
rusting of iron is faster in rainy days because water is responsible for the rusting of iron i.e the presence of oxygen
Sound travels faster in iron. Usually sound travels faster in media with higher density. Also presence of lattice makes difference too.
soda because it is the most acidic