WorksheetsChapter 4 - Pressure System
Total questions: 10
Worksheet time: 5mins
According to Buys Ballot's Law, if you stand with your back to the wind (P.39):
The low pressure is in front of you
In the Northern Hemisphere, the low pressure is on the right
In the Southern Hemisphere, the low pressure is on the right
In the Southern Hemisphere, the low pressure is on the left
In the Northern Hemisphere (P.39):
wind will move around a low pressure system in an anti-clockwise direction
wind will move around a low pressure system in a clockwise direction
wind will move around a high pressure system in an anti-clockwise direction
wind will move around a low pressure system in a linear direction
Thermal depressions (P.41):
Occur over land during winter
are usually formed by surface heating
are usually formed when cold air masses meet warm air masses
Occur over sea during summer
Frontal depressions are found (P.40):
temperate latitudes
Equatorial regions
Polar regions
Virtually anywhere
In a depression (P.40):
air is converging at high altitude and diverging at the surface
air is converging at the surface and diverging at altitude
air is converging at the surface and at altitude
air is diverging at altitude and at the surface
An anticyclone (P.42):
is a region of relatively high pressure
is a region of relatively low pressure
shows similar weather conditions as a depression
is indicated on a weather chart with isobars with low pressure at the centre
One of the weather conditions usually associated with depression is (P.42):
calm winds
extensive clouds, possibly all the way to the tropopause
good visibility in precipitation
poor visibility in ascending air
A blocking anticyclone (P.45):
prevents the usual eastward movement of frontal depression
forces the frontal depression to move towards the south in the Northern Hemisphere
prevents the usual westward movement of frontal depression
produces unstable weather conditions
Temporary Cold Anticyclone (P.44):
produces unstable weather
can last for weeks
usually does not last more than 24 hours
is a trough of low pressure
A typical anticyclonic weather during summer is (P.45):
strong winds
heavy rain
thick clouds
light winds
