QUESTION 6 When a plate of oceanic lithosphere meets a plate whose leading edge

Question

QUESTION 6 When a plate of oceanic lithosphere meets a plate whose leading edge is continental lithosphere along a convergent plate boundary, what is the result? A volcanic island arc, like the modern Aleutian Islands in Alaska. A mountain belt, like the modern Himalayas. Earthquakes, but no volcanism, like the modern San Andreas Fault in California. A continental volcanic arc, like the modern Andes. QUESTION 7 10 The magnetic field of Earth in the geologic past is Click Save and Submit to save and submit. Click Save AllA to save all answers

Explanation / Answer

Answer : 6 : First Option

The dense, leading edge of the oceanic plate actually pulls the rest of the plate into the flowing asthenosphere and a subduction zone is born! Where the two plates intersect, a deep trenchforms.

Hence a volcanic island arc, like modern Aleutian Islands in Alaska is formed.

Answer : 7 :The direction of the Earth’s magnetic field has not been constant through geologic time. This direction, also known as the polarity of the magnetic field, changes periodically on an irregular basis. The polarity can be normal or reversed.Normal polarity is where the magnetic north points (roughly) towards the geographic north pole. This is how the magnetic field is aligned today. Reversed polarity is in the opposite direction, and the north end of the magnetic field is close to the present-day south pole.

The magnetic field of Earth in the geologic past is known to have experienced numerous polarity reversals due to paleomagnetism of iron-rich minerals in rocks.

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