The moon and Earth remain in a stable orbit due to their mutual gravitational attraction being offset by
inertia. Indicate whether the statement is true or false.
ANS: T
Inertia is the tendency of moving objects to continue in a straight line. This keeps the moon and Earth
in orbit together. Information can be found in the section Tides Are Forced Waves Formed by Gravity
and Inertia.
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In comparison to liquid water, the density of the ice in hail is:
A) 50% of water. B) 70% of water. C) 90% of water. D) no difference
What evidence made scientists hypothesize that dust contained calcium?
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