= protons (positive) + neutrons(neutel);atomic mass is the number of protons plus neutrons .

(negative) move around the nucleus.

Know the layers of the earth in order from thickest to thinnest and know order layers from outside to inside

thick to thin: mantle, outer core, inner core, crust. outside to inside: crust mantle, outer core, inner core. the crust floats on the mantle because it is less dense.

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mrs stagg

Question	Answer
nucles	= protons (positive) + neutrons(neutel);atomic mass is the number of protons plus neutrons .
Electrons	(negative) move around the nucleus.
Know the layers of the earth in order from thickest to thinnest and know order layers from outside to inside	thick to thin: mantle, outer core, inner core, crust. outside to inside: crust mantle, outer core, inner core. the crust floats on the mantle because it is less dense.
know the compostive of each layer crust earths surface and continental/oceanic plates where we live