Which best describes how magnesium and oxygen bond?
a. they form an ionic bond by exchanging two electrons.
b. they form an ionic bond by exchanging three electrons.
c. they form a covalent bond by sharing one electron.
d. they form a covalent bond by sharing four electrons.
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Which accurately compares concave and convex lenses?

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?