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I do not know if this is correct, but I think it is number 1, Voice uses a wider range of pitch and volume as compared to speaking. Hope it helped!
Explanation:
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I guess that the answer would be the 'political boundaries'
Answer: Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. At a spreading center, basaltic magma rises up the fractures and cools on the ocean floor to form new seabed.
You would weigh the most on a boat because you are on earth. You would weigh the same as you usually do due to the gravity. You would weigh less on a space shuttle or on the moon because of the difference in gravity.