Chp 3 Geog

The outermost region of the atmosphere, based on composition, is the

heterosphere.

The high temperatures in the thermosphere occur because

it is in direct contact with high energy solar radiation.

How much of the Sun's ultraviolet radiation reaches Earth's surface?

little of the ultraviolet radiation

Which of the following lists the correct sequence of gases, from most to least, in terms of percentage within the homosphere?

nitrogen, oxygen, argon, carbon dioxide, trace gases

What is another name for the ozone layer?

ozonosphere

The homosphere is so called because

the blend of gases is nearly uniform throughout.

The solar constant is measured at

the outer boundary of the exosphere (32,000 km (20,000 mi)).

In terms of incoming solar radiation (insolation), which is the correct order?

thermosphere, mesosphere, stratosphere, troposphere

Three criteria used for classification of the atmosphere explained in the text are

composition, temperature, and function.

Which of the following is false?

Air pressure decreases through the troposphere then increases in the stratosphere

Which of the following best describe conditions in the mesosphere?

High altitude noctilucent clouds form in the mesosphere.

Which of the following is true of the mesosphere?

It contains clouds that are visible at night.

What would happen to the oxygen atoms in ozone if the ozone layer were completely destroyed by ultraviolet radiation?

The oxygen atoms would be bound together in pairs.

How is ozone formed in the stratosphere?

Ultraviolet radiation breaks apart molecules made up of paired oxygen atoms. Individual oxygen atoms bond with paired oxygen molecules to form ozone.

How do CFCs cause ozone depletion?

Ultraviolet radiation breaks down CFCs, molecules containing chlorine. Chlorine then breaks one oxygen atom away from ozone, leaving behind a paired oxygen molecule.

What is ozone?

a molecule made up of 3 oxygen atoms