What are two properties that can differentiate between pure nickel and pure iron?
A. Density and electrical conductivity
B. Magnetism and thermal conductivity
C. Appearance and density
D. Appearance and state at room temperature
SUBMIT

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101

answer; benefit; harmed;