Final answer:
The statement provided is false;
the dry adiabatic lapse rate is about 9.8C/1000 meters for dry air, and the moist adiabatic lapse rate is less, ranging from 5C/1000 meters to 9C/1000 meters depending on moisture content.
Step-by-step explanation:
The statement that the DRY adiabatic rate varies from about 5C/1000 meters in moist air to 9C/1000 meters in dry air is false.
In fact, the dry adiabatic lapse rate (DALR) is approximately 9.8C/1000 meters for dry air. When the air contains moisture and condensation occurs, the process releases latent heat, which slows the rate of temperature decrease, leading to the moist adiabatic lapse rate (MALR), which varies but is typically less than the dry adiabatic lapse rate, ranging from about 5C/1000 meters to 9C/1000 meters depending on the moisture content.
False.
The dry adiabatic lapse rate is a constant rate of temperature change with altitude for a rising parcel of dry air. It is approximately 9.8°C per 1000 meters (or 5.5°F per 1000 feet).
The lapse rate is not affected by the moisture content of the air; it remains fairly constant for dry air. The statement in the question seems to be a bit confusing or may contain an error.