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UNIDAD 2: CONTINENTES Y OCÉANOS
ACTIVITY 8: EARTHQUAKES AND VOLCANOES
1. Read the text:
The Earth has three major layers: the core, mantle and crust. (figure 1) The crust and the top of the mantle make up a thin skin on the surface of our planet. This skin looks like a puzzle on the surface of the Earth, with many different pieces (figure 2). The pieces move around very slowly, sliding past one another and bumping into each other. We call these puzzle pieces tectonic plates, and the edges of the plates are called the plate boundaries. The plate boundaries are made up of many faults (fig. 3), and most of the earthquakes around the world occur on these faults.
Figure 1
Figure 2
Figure 3
2. Read the text:
Earthquakes
are recorded by instruments called seismographs. The recording they
make is called a seismogram. (figure 4) The seismograph has a
base that sets firmly in the ground, and a heavy weight that hangs free.
When an earthquake causes the ground to shake, the base of the seismograph
shakes too, but the hanging weight does not. The difference in position
between the shaking part of the seismograph and the motionless part is what is
recorded.
Figure 4
No, and it is unlikely they will ever be able to
predict them. Scientists have tried many different ways of predicting
earthquakes, but none have been successful. On any particular fault,
scientists know there will be another earthquake sometime in the future, but
they have no way of telling when it will happen.
Information
from: http://earthquake.usgs.gov/
3.Visit
the following Internet link and
answer the questions in your notebok:
Clich here
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