Internal dynamics of the Earth

Earth’s internal layers

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Worksheets answers unit 9

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Worksheet 3
1. extrusive; 2. lava cools and solidifies quickly ; 3. and 4. examples are: volcanic scoria, pumice stone, obsidian, basalt; 5. intrusive; 6. magma which cools and solidifies slowly; 7. and 8. examples: granite, pegmatite, syenite, gabbro.
1. Pumice: spongy appearance, it can float in water, usually a light colour.
2. Granite: crystals of feldspar, quartz and mica. Black and white.
Worksheet 4
1d; 2; 3b; 4a.

1F; It measures the intensity of Earthquakes; 2T; 3T; 4F; They are called seismic waves; 5F; The most
abundant gases are carbon dioxide and water vapour; 6F; They are made up of the crust and the upper mantle.
See diagram, Student’s Book, page 101.
Worksheet 5
1. The people of Pompeii were completely unprepared.
2. Only some of the people left the area immediately.
3. The next avalanche of hot ash, pumice, rock and
gases killed moist people.
4. Pompeii has never been rebuilt.
First, there were earth tremors and smoke from the volcano. Then, the volcano erupted. Next, there was
a rain of ash. After that, there was an avalanche of hot ash, pumice, rock fragments and volcanic gases.
Finally, the wave of ash asphyxiated everyone.
Test 9
1a; 2b; 3a; 4c; 5 b; 6a; 7c; 8b; 9c; 10a.
See diagram of an earthquake, Student’s Book, page 102.

Unit 9 – activities

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  1. Read the post Plate boundaries in the blog and match the different types of boundaries in both classifications.


  1. Divergent boundaries
  2. Convergent boundaries
  3. Transform boundaries
  • Destructive plate boundary
  • Collision zones
  • Constructive plate boundary
  • Conservative plate boundary




  1. Draw a volcano and label all the parts using the information that is in the post Structure of a volcano in the blog
  2. Research: Where does lava come from?Find in the same blog the article “Hot Lava: Where does it come from?”, read it and answer the question briefly using your own words.




  1. Read about Earthquakes in eSchool Today and answer the questions: What is an Earthquake? and How do earthquakes form?