Fill in the blanks.

1. _______________ may change moment to moment.
2. The _____________ divides the earth into two equal parts.
3. Humidity is expressed in ________________.
4. A ____________ is used to measure atmosphere pressure.
5. Meteorologists measure ____________ with a rain gauge.

Match the following:

Write 'T' for True and 'F' for False.

1. An anemometer measures the air pressure.
2. A wind vane tells the direction of the wind.
3. At the Equator the sunrays fall directly.
4. A barometer contains mercury.
5. A hygrometer measures relative humidity.
6. Temperature is measured in Celsius only.
7. Movement of air into a low pressure area leads to the development of a depression with clouds and rain.

Choose the correct answer.

1. A barometer is an instrument used to measure.
   1. Air pressure
   2. Hydraulic pressure
   3. Tectonic pressure
   4. Glacial compression under ice sheets
2. The standard sea-level atmospheric pressure in millibars (mb) is
   1. 1000.0
   2. 1013.2
   3. 1013.0
   4. 1000.2
3. Wind speed is measured using an instrument called
   1. Barometer
   2. Wind vane
   3. Speedometer
   4. Anemometer
4. Clouds usually form when
   1. Air temperature reaches dew point
   2. Evaporation has warmed the surrounding air
   3. Relative humidity is 0%
   4. Condensation has been removed from the air
5. A hygrometer is an instrument used for measuring
   1. Absolute humidity
   2. Wind speed
   3. Relative humidity
   4. Atmospheric pressure

What is weather?