The number of tornadoes that we have every year
depends on how big an area you are looking at.
It's also difficult to answer because some
tornadoes are a lot more powerful than others, but
the powerful ones are also rare. The weak, common
tornadoes may in fact be so weak that we don't
even realize that they're tornadoes, which makes
counting or guessing at the true number of
tornadoes even harder.
The National Oceanographic and Atmospheric
Administration (NOAA) has published a graph of
tornadoes per year estimated around the world. You
can see it here, please ask your teacher to see it
with you, so you can receive help to read the
here to see the graph
In this graph, notice that the number of
tornadoes per year is getting larger as you move
to more recent time to the right. Is this because
we're looking harder and seeing more, or is it
because of global warming?
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