Answer:
by wearing of rocks
Explanation:
earths gravity your welcome
Shielding electrons are the electrons in the energy levels between the nucleus and the valence electrons. They are called "shielding" electrons because they "shield" the valence electrons from the force of attraction exerted by the positive charge in the nucleus. Hope this helps!!
Answer:
The sum of the protons and neutrons.
Explanation:
protons + neutrons = atomic mass
Add 4H2 in the reactant side, that will give you 4H2O in the product side.
The correct answer would be D: Physical properties can be observed without changing the identity of a substance
