Daytime temperatures on Mercury are extremely hot because: it is close to the sun
there are volcanoes
one side is facing the sun
it has long days
it gives off internal heat

*multiple choice*

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

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In science and physics what is the standard unit of measure for speed?