Answer:
It is a sample of matter with both constant and definite composition
Explanation:
is a sample of matter with both definite and constant composition
a pure substance has a definite quantifier which cannot be changed
4.13X10^3= 4130 in the expanded form
CXbxcbfvbdffdffzsarg
Plates at our planet's surface move because of the intense heat in the Earth's core
Hopefully this helps, I believe in you! ^^