Which pair of atom an ionic bond

What causes eclipses? check all that apply. earth's rotation on its axis moon's shadow covering the sun earth's shadow covering the moon earth's orbit and moon's orbit occasionally aligning the moon and sun's gravity pulling in the same direction

Math focus 4. calculate a map has index contours at 250 m, 500 m, and 750 m. what is the contour interval?

What does spontaneous generation mean?