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?
A) crystals found high on ridges B) limestone formations on prairies C) the color of dust on windswept plateaus D) dissolved calcite in the ground
Which of the following is true of pure water?
A) [H3O+] < [OH-] B) [H3O+] = [OH-] C) [H3O+] > [OH-] D) pure water is an electrolyte
________ generally constitutes the highest percentage of the annual sediment load moved by a stream
A) Bed load B) Saltation load C) Dissolved load D) Suspended load