Because its heavy and it was available
By people sailing or drifting from southeast Asia
Answer:
crust- the earth's outmost layer
inner core- the metallic layer at the earth's center
lower mantle- hottest part of the mantle
asthenosphere- the semi solid layer between the top layer and the upper mantle
upper mantle- The layer between the asthenosphere and lower mantle
top layer- The firm layer between the crust and the asthenosphere
outer core- The layer surrounding the inner core
Explanation:
