Contoh Explanation Text
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"Tsunami"
The term of “tsunami” comes from the Japanese
which means harbour ("tsu") and wave ("nami"). A tsunami is a series of
waves generated when water in a lake or a sea is rapidly displaced on a
massive scale.
A tsunami can be generated when the sea floor
abruptly deforms and vertically displaces the overlying water. Such
large vertical movements of the earth's crust can occur at plate
boundaries.
Subduction of earthquakes are particularly effective in generating tsunami, and occur where denser oceanic plates slip under continental plates.
As
the displaced water mass moves under the influence of gravity to regain
its equilibrium, it radiates across the ocean like ripples on a pond.
Tsunami
always bring great damage. Most of the damage is caused by the huge
mass of water behind the initial wave front, as the height of the sea
keeps rising fast and floods powerfully into the coastal area.
"How Earthquakes Happen"
Earthquake
is one of the most destroying natural disasters. Unluckily it often
happens in several regions. Recently a horrible earthquake has shaken
West Sumatra. It has brought great damages. Why did it occur? Do you
know how an earthquake happens?
Earthquakes are usually caused
when rock underground suddenly breaks along a fault. This sudden release
of energy causes the seismic waves. It make the ground shake. When two
blocks of rock or two plates are rubbing against each other, they stick a
little. They don't just slide smoothly. The rocks are still pushing
against each other, but not moving. After a while, the rocks break
because of all the pressure that's built up. When the rocks break, the
earthquake occurs.
During the earthquake and afterward, the
plates or blocks of rock start moving, and they continue to move until
they get stuck again. The spot underground where the rock breaks is
called the focus of the earthquake. The place right above the focus is
called the epicenter of the earthquake.
"How does Rain Happen?"
Rain
is the primary source of fresh water for most areas of the world,
providing suitable conditions for diverse ecosystems, as well as water
for hydroelectric power plants and crop irrigation.
The
phenomenon of rain is actually a water circle. The concept of the water
cycle involves the sun heating the Earth's surface water and causing
the surface water to evaporate. The water vapor rises into the Earth's
atmosphere.
The water in the atmosphere cools and condenses into
liquid droplets. The droplets grow until they are heavy and fall to
the earth as precipitation which can be in the form of rain or snow.
However,
not all rain reaches the surface. Some evaporates while falling through
dry air. This is called virga, a phenomenon which is often seen in hot,
dry desert regions.
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