Question of the Day
Question: What is a magnetic reversal and what
evidence do we have that they occur?
Answer: … … …
p. 566 CYU # 1 -7
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 # 1 -7
2. Determine what type of plate tectonic boundary each of the following
describes:
a. plates move alongside each other Transform boundary
b. plates move toward each other Convergent plate boundary
c. plates move away from each other Divergent plate boundary
p. 566 CYU # 1 -7
3. 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 # 1 -7
4. Determine whether each of the following is likely to occur at convergent
or divergent boundaries
a. rift valley divergent boundary
c. mid-ocean ridge divergent boundary
b. continental mountains convergent d. ocean trench convergent boundary
Transform
Convergent
Divergent
p. 566 CYU # 1 -7
5. 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 # 1 -7
6. 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 # 1 -7
6. 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.