Name
Date
Vocabulary
STUDENT RESOURCE 5.1
INFORMATION SHEET
anemometer a weather instrument used
wind the horizontal movement of air
to measure wind speed
Wind is caused by the unequal heating
Wind speed may be measured in
of Earth’s surface and the air above it.
either knots or miles per hour.
Beaufort wind scale a system of rating
wind speed based on the effect of the
wind on outdoor objects such as trees
and fl ags
The scale rates wind speed from 0 to
12, with 0 representing dead calm and
12 representing hurricane-force winds.
WEATHER AND WATER • SECTION 5 WIND DIRECTION AND SPEED