6.What do you call a sounding gear used to navigate and map out the seafloor.
A.Solar
B.Sonar
C.Radar
D.Satellites
7.it is a phenomenon when the north pole is transformed into the south pole and south pole becomes the north pole.
A.Earth flip
B.Magnetic flip
C.Convection
D.Subduction
8.Which of the following statements is TRUE?
A.The rate of formation of new seafloor at he mid-ocean ridge is not always as fast as the destruction of the old seafloor at the subduction zone
B.Harry hess found during his explorations found out that the bottom of the sea is as smooth as expected
C.Rocks found near the ridge are older compared to those that are farther from the ridge
D.Old rocks are added to the ocean floor at the ridge with approximately equal amounts on both sides of the ocean ridge
9.Early observers thought continents might have been joined based on what observation?
A.Rocks and fossils
B.Earthquakes
C.Magnetism
D.Coastline
10.A magnetic reversal happens many times in the past.
A.True
B.False
C.It never happened yet
d.happened only once

By magnetic reversal, or 'flip', we mean the process by which the North pole is transformed into a South pole and the South pole becomes a North pole.

9. D

Bacause continents can ony be considered as one if it has 1 coastline

10. A

Reversal occurrences are statistically random. There have been 183 reversals over the last 83 million years (on average once every ~450,000 years). The latest, the Brunhes–Matuyama reversal, occurred 780,000 years ago, with widely varying estimates of how quickly it happened.

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