Question

What is the chief ore of iron?
What is the meaning of an object has 2 meter length.

Answer 1

Hematite

Banded iron formations may contain iron in carbonates (siderite or ankerite) or silicates (minnesotaite, greenalite, or grunerite), but in those mined as iron ores, oxides (magnetite or hematite) are the principal iron mineral.

An object with a length of 2 metres is 2 metres long. For example: ____________________ <---------------2m-----------------> This line has a length of two metres.