Worksheets answers unit 9

Posted on

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.