The focus of an earthquake is a place within earth along a fault at which you feel the last movements of the earthquake.
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will try to give brainliest to the first answer not to sure how

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called