first, a correction of typo: the core of the earth. I mentioned magnesium in the outer core. this is an error. there is no magnesium
According to many sources, the core has sulfur and iron and nickel.
outer core is liquid iron and nickel
inner core is solid iron (and nickel too but this is not noted in provincial exams...)
Here's a geophysics site with more details.
Quiz next period on:
parts of the earth: name the layers and write a short description of their properties
types of plate boundaries: divergence, convergence, transform
We will examine rocks next period too.