WORD DEFINITION
NUCLEUS 1.
A) NEGATIVE CHARGED PARTICLE OF AN ATOM
PROTON 2.
B) PARTICLE OF AN ATOM WITH NO CHARGE
NEUTRON 3.
C) THE CENTER OF AN ATOM
ELECTRON 4.
D) POSITVE CHARGED PARTICLE OF AN ATOM
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Nuecleus: C the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.

Proton: D a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

Neutron: B a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

Electron: A a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Explanation:

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.