Answer:
Iron and Nickel
Explanation:
Contains the densest elements, has a radius of about 3,400 km, and accounts for about 35% of Earth's mass.
her is this from google
"A system of temporary reference points established in the field allows users to move freely within the study area without losing the geo-referencing. It allows the user to perform the mapping of trees, deadwood, transects, repeated measurements and data verification."
None of them because this question is worded awfully
