Question of the Day Question: What is a magnetic reversal and what evidence do we have that they occur? Answer: ……… Turn In: -Seafloor Model Questions.

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Presentation transcript:

Question of the Day Question: What is a magnetic reversal and what evidence do we have that they occur? Answer: ……… Turn In: -Seafloor Model Questions -WS 12-5 & 17.1 (blue)

p. 566 CYU # 1 -7

1. Explain why the inner core remains a solid even though it is very hot. 1. The inner core remains a solid even though it is very bot because pressure due to the weight of the mantle and crust is so great that the atoms are forced together as a solid.

Earth’s Core

p. 566 CYU # Determine what type of plate tectonic boundary each of the following describes: a. plates move alongside each other b. plates move toward each other c. plates move away from each other Transform boundary Convergent plate boundary Divergent plate boundary

p. 566 CYU # Describe how the gap is filled when two tectonic plates move away from each other. 3. When two tectonic plates move away from each other, the gap is filled by hot molten rock (magma) that rises from the asthenosphere and cools. This cooled magma forms new lithospheric rock.

p. 566 CYU # Determine whether each of the following is likely to occur at convergent or divergent boundaries a. rift valleyc. mid-ocean ridge b. continental mountainsd. ocean trench divergent boundary convergent divergent boundary convergent boundary Transform ConvergentDivergent

p. 566 CYU # Explain how magnetic bands provide evidence that tectonic plates are moving apart at mid-ocean ridges. 5. Alternating magnetic bands could only be formed if the plates have been slowly moving apart while the magnetic poles periodically reverse.

p. 566 CYU # Predict what type of plate boundary exists along the coastline near Japan’s volcanic mountain ranges. 6. A convergent boundary exists there because convergent boundaries form volcanic mountains.

p. 566 CYU # Predict what type of plate boundary exists along the coastline near Japan’s volcanic mountain ranges. 6. A convergent boundary exists there because convergent boundaries form volcanic mountains. 7. The oldest continental rocks are 4 billion years old, whereas the oldest sea-floor rocks are 200 million years old. Explain the differences in these ages. 7. The difference in the ages is due to the fact that seafloor is created and destroyed at a faster rate than crust on land.