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"Earthquake" The Unquiet Earth PPT Courseware 3
Experimental requirements:
Use towels and sticks to simulate rock layers:
(1) Fold the towel into a rectangle, hold the two ends of the towel with your hands and squeeze it toward the middle. What phenomenon will you find?
(2) Hold both ends of the wooden stick and apply force again. Observe what will happen? How do your hands feel?
Thinking: What does the experimental phenomenon show? Can you reason and imagine how earthquakes are formed?
Experimental results
Rock formations underground deform under pressure.
When the force is too great to bear, the rock formation will break suddenly and rapidly.
The seismic waves generated by the fracture of rock layers will cause vibrations on the surface when they reach the surface. This is an earthquake.
Kind tips
1. Pay attention to safety and don’t let the sticks hurt yourself and your classmates.
2. Divide work and cooperate within the group and carefully observe experimental phenomena.
3. After the experiment, pack away the experimental materials.
do you know?
There are often some precursors before earthquakes, such as sudden rise and fall of groundwater, turning and swirling, well water bubbling, changing smell, becoming muddy, animals panicking, and abnormal weather.
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