* not completed

. Which of the following is a constant gas?

Carbon dioxide correct incorrect

Oxygen correct incorrect

Water vapour correct incorrect

Ozone correct incorrect

* not completed

. Of the following gases, which has the shortest residence time?

Water vapour correct incorrect

Nitrogen correct incorrect

Methane correct incorrect

Chlorofluorocarbons correct incorrect

* not completed

. What is denitrification?

The process by which bacteria convert nitrogen in the soil to nitrogen gas or nitrous oxide gas correct incorrect

The process by which nitrogen gas is split apart by the absorption of radiation correct incorrect

The process by which nitrogen gas is removed from the atmosphere and converted to a soluble form correct incorrect

The process by which nitrogen gas enters a reservoir correct incorrect

* not completed

. Which of the following is NOT a sink for oxygen?

Combustion correct incorrect

Respiration correct incorrect

Decomposition correct incorrect

Photosynthesis correct incorrect

* not completed

. Where does water vapour originate?

Falling precipitation correct incorrect

Rivers correct incorrect

Oceans correct incorrect

Respiration correct incorrect

* not completed

. Which of the following is NOT true about ozone?

It is a greenhouse gas. correct incorrect

It forms naturally in the heterosphere. correct incorrect

It absorbs ultraviolet radiation from the sun. correct incorrect

It is a pollutant. correct incorrect

* not completed

. Which type of aerosols have a radius of less than 0.1 µm?

Secondary correct incorrect

Large correct incorrect

Aitken correct incorrect

Giant correct incorrect

* not completed

. Which of the following statements about sulphate aerosols is true?

They can scatter sunlight and cause cooling. correct incorrect

They are produced by gas-to-particle conversions of volatile organic compounds. correct incorrect

They are examples of primary aerosols. correct incorrect

They enter the atmosphere through the evaporation of sea spray. correct incorrect

* not completed

. During the heavy bombardment period, our primitive atmosphere contained primarily which two gases?

Nitrogen and water vapour correct incorrect

Carbon dioxide and sulphur correct incorrect

Water vapour and carbon dioxide correct incorrect

Sulphur and nitrogen correct incorrect

* not completed

. Why there is no source for carbon dioxide on Mars?

It has a large greenhouse effect. correct incorrect

It is too cold. correct incorrect

It has a small gravitational field. correct incorrect

Its cool interior does not support active plate tectonics. correct incorrect

* not completed

. When the inflows to a reservoir are equal to the outflows from that reservoir, a condition known as steady state exists.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. The source for atmospheric nitrogen is a process known as nitrogen fixation.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. Clouds are good absorbers of longwave radiation.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. Molecular diffusion is dominant in the homosphere.

TRUE correct incorrect

FALSE correct incorrect

* not completed

. Venus has a larger greenhouse effect than Earth.

TRUE correct incorrect

FALSE correct incorrect