The least dense layer of the earth is the crust.
it has an electrons in a fixed path together on energy levels.
P waves are faster S wave are slower P waves can pass through both solids and liquids S waves bounce of solids
Answer: Atoms are the hardest substance to separate
Answer:
Those with 3 protons and 3 neutrons are known as the isotope lithium-6. Those with 3 protons and 4 neutrons are known as the isotope lithium-7.
Explanation:
