Answer:
1. False
2.True
3.False
4.False
5.True
Explanation:
All About Earthquakes: The Science Behind Earthquakes
What is an earthquake?
An earthquake is what happens when two blocks of
the earth suddenly slip past one another. The surface
where they slip is called the fault or fault plane. The
location below the earth’s surface where the
earthquake starts is called the hypocenter, and the
location directly above it on the surface of the earth is
called the epicenter.
Sometimes an earthquake has foreshocks. These are
smaller earthquakes that happen in the same place as
the larger earthquake that follows. Scientists can’t tell
that an earthquake is a foreshock until the larger
earthquake happens. The largest, main earthquake is
called the mainshock. Mainshocks always have aftershocks that follow. These are smaller
earthquakes that occur afterwards in the same place as the mainshock. Depending on the size of
the mainshock, aftershocks can continue for weeks, months, and even years after the
mainshock!
What causes earthquakes and where do they happen?
The earth has four major layers: the inner
core, outer core, mantle and crust. (figure
2) The crust and the top of the mantle
make up a thin skin on the surface of our
planet. But this skin is not all in one piece –
it is made up of many pieces like a puzzle
covering the surface of the earth. (figure 3)
Not only that, but these puzzle pieces keep
slowly moving around, 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, and most of the
earthquakes around the world occur on these faults. Since the edges of the plates are rough,
they get stuck while the rest of the plate keeps moving. Finally, when the plate has moved far
enough, the edges unstick on one of the faults and there is an earthquake.
Why does the earth shake when there is an
earthquake?
While the edges of faults are stuck together, and
the rest of the block is moving, the energy that
would normally cause the blocks to slide past one
another is being stored up.
