2.2

1. a landslide is the movement of a mass of rock or sections of the Earth’s crust under the force of gravity.

2. heavy rainfall saturating the soil, vibrations from earthquakes and undercutting of banks and cliffs from waves or rivers.

3. construction of roads and railways on hillsides along with building works can weaken hillsides and make them more vulnerable during heavy rainfall.

4. earthquakes are intra-plate tension where movements occur along cracks and faults in the Earth’s crust. The force is measured on the Richter scale

5. intra-plate tension when movements occur along cracks and faults in the Earth's crust

6. once each 15 months

7. improved building codes and practices, and closer monitoring of seismic activity.

8. a landslide is movement on top of the Earth’s crust and an earthquake is movement under the Earth’s crust

9. a tsunami is the movement of the ocean bottom displaces water on the surface, forming a tsunami which moves outwards in all directions from the centre of the disturbace.

10. earthquake, landslide or volcano

11. first sudden shifting of the continental plates causes earthquakes, forcing sea water above to rise forming race. Then waves move rapidly in deep ocean reaching speeds of 800 kph. As the waves near land they slow to about 45 kph but are squeezed upwards, increasing in height. The waves start to head inland and destroy anything in their paths.

 

12. shake, drop and roar

13. the indo-Australian plate was sliding under the Eurasion plate

14. 23, 20 minutes

15. the wave slowed down to 100 kph and surged inland causing destruction to coastal communities.

16. they coordinated the development of a tsunami warning system for the indian ocean.

17. he is a Wollongong university geoscience professor, he has warned that tsunamis triggered by New Zealand’s alpine fault line could strike NSW as often as once every 500 years.

18.          a) 15 N, 100 E

               b)              i) 2hours

                                ii) 7 hours

                                iii) 5 hours

                                iv) 9 and a half hours

19. in december 1989 the community of newcastle was struck by an earthquake tat measured 5.6 on the richter scale, killing 13people and injuring more than 120. it also impacted on buildings, with 35,000 homes and 3,000 other buildings being moderately to seriously damaged in newcaslte, and a total of 70,000 buildings in the region sustaning minor damage. This is extremely devastating as alot of people has gotten hurt or even dead. also alot of people have no homes to go to and dont know what to do.
20.

My Tsunami sign

Google's Tsunami Sign