Download The Dunedin Volcano

The Dunedin Volcano
Use the resource “The Dunedin Volcano” to answer the following questions. Include pictures
sourced from the internet where appropriate (eg harbour cone). ALL pictures should have a
caption.
1a. What kind of volcano is the Dunedin Volcano?
1b. How long has it been extinct for?
2. Fill in the gaps: Between 250-150 mya (m_____n y_____rs ago) sand and mud hardened
to stone. Eventually h___t and pressure turned this rock into schist by a process called
m_____________s.
3. Fill in the gaps: Schist then formed a peneplain by erosion. A p_______n is a “formerly
mountainous or hilly area reduced nearly to a plain by erosion, often found near s_a level”
4. When did NZ split from Australia?
5. What built up on top of the schist?
The first eruptions…
6. When were the first eruptions?
7. What area was the volcano centred on?
8. Surprisingly Harbour Cone isn’t actually a volcanic cone. What is it? (see caption). Include
a captioned picture of Harbour Cone.
9. When was the second eruptive phase?
10. What rocks came from the two main lava flows during the second eruptive phase?
11. When was the third eruptive phase? This was the last active period.
12. What rocks were produced during the third eruptive phase?
13. Where was the third eruptive phase centred on?
14. Fill in the gaps: As there were no more eruptions the r____s produced in the third phase
are the youngest v______c rocks in Dunedin – around Mt Cargill, Flagstaff, Swampy.
15. What was the maximum height of the volcano?
16. Fill in the gaps: At different times the Dunedin v______o was covered with a_h, lava and
f______t. Remains of the forest (including palms) indicate Dunedin was much warmer than
now.
*Blue Panel (extension)
A) What was the most common rock formed from the Dunedin volcano?
B) Why are some rocks dark and some rocks light?
C) Use google or a dictionary to find out what the difference is between a rock and a
mineral.
After the Volcano
17. Why is the volcano no way near 1000m now?
18. Explain why Flagstaff & Swampy are so high compared to the rest of the volcano.
19. What is loess and where is it found?
20. What is special about Otago Harbour, Blueskin Bay, Papanui Inlet, Hoopers Inlet?
21. The peninsula was once an island, why isn’t it an island anymore?