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13 Cards in this Set
- Front
- Back
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what is an aftershock? |
aftershocks are the smaller earthquakes that follow the main earthquake |
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the strength or magnitude of an earthquake is measured using what? |
the richter scale is used to measure the magnitude of an earthquake |
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the point on the earth's surface that is directly above an earthquake is called the? |
the epicentre is the point on the earth's surface that is directly above where an earthquake takes place inside the earth (the focus) |
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what causes earthquakes? |
earthquakes are caused when tension is released inside the earth's crust
the tension occurs because two plates (moving in different directions) get stuck |
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where do volcanic eruptions tend to take place? |
volcanic eruptions may take place on constructive and destructive plate boundaries, but not along conservative plate boundaries |
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people can be prepared for earthquakes by? |
earthquake drills and education via TV and radio will all help people to be prepared in the event of an earthquake |
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which part of the earth is directly below the crust? |
the mantle is directly below the earth's crust
nearer the centre of the earth this layer is softer, towards the outside it is harder |
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a destructive or convergent boundary is when? |
at destructive or convergent boundaries the plates move towards one another |
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what occurrence is common along a conservative plate boundary? |
earthquakes are common along conservative plate boundaries and volcanoes do not occur |
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name some warning signs of an eruption? |
- gas and steam emissions increase
- surface snow and ice may melt with rising ground temperatures
- small animals may die from rising carbon dioxide emissions close to the ground |
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how can you deal with an eruption? |
there needs to be a detailed plan for dealing with eruption such as an exclusion zone around the volcano, an emergency supply of basic provisions and an evacuation plan |
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is it easy to predict earthquakes? |
no, it is not as easy to predict earthquakes, but there are some ways of monitoring the chances, such as laser beams to detect plate movement and a seismometer to pick up vibrations |
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what are the problems with predicting earthquakes? |
false warnings could cause -disruption -economic loss |
