Free Printable TOPIC 3

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TOPIC 3

Total questions: 17

Worksheet time: 6mins

Name

Class

Date

Second layer of the atmosphere, extending about 17-48 kilometers above the earth’s surface. It contains a layer of gaseous ozone, which filters out about 95% of the incoming harmful ultraviolet radiation emitted by the sun

Mesosphere

Troposphere

Stratosphere

Ozone

Layer of gaseous ozone in the stratosphere that protects life on earth by filtering out most harmful ultraviolet radiation from the sun

Greenhouse Gases

Troposphere

Stratosphere

Ozone Layer

The breakdown of stratospheric ozone
I. can originate from the emission of chlorofluorocarbons (CFCs).
II. is catalyzed through a free chlorine (Cl) atom.
III. prevents UV rays from reaching the earth’s surface.

I only

III only

I,&II

I,II,& III

Which agreement allowed for a reduction, and eventual elimination, of CFC production and use?

Montreal Protoccol

Kyoto Protoccol

Paris Agreement

Yo MaMa

How do CFCs affect ozone production?

UV radiation frees a chlorine atom, which breaks down ozone.

Infrared radiation frees a chlorine atom, which breaks down ozone.

UV radiation frees a fluorine atom, which breaks down ozone.

Infrared radiation frees a chlorine atom, which breaks down ozone.

Depletion of ozone layer is a concern because it normally absorbs ____% of the sun's UV radiation.

Which of these sets of three items produce CFCs

cars, factories, and cardboard

spray cans, cardboard, insulation

spray cans, refrigerant, cardboard

spray cans, refrigerant, insulation

Though CFC production has been curtailed, the threat to upper atmosphericozone continues because CFCs

become harmless quickly.

destroy ozone for only a short time.

persist but stop destroying ozone.

persist and continue to destroy ozone for decades.

When oxygen gas in the lower stratosphere is struck by this, it splits, leading to the formation of a ozone molecule.

visible light

ultraviolet radiation

infrared

gamma rays

10.

The formation of ozone begins when and O2 molecule is split by

UV-A radiation

UV-B radiation

UV-C radiation

UV-A or UV-B radiation

11.

How many ozone atoms can a single chlorine atom break down?

5,000

10,000

50,000

100,000

12.

Which is NOT a result of the reduction in stratospheric ozone?

reduced photosynthetic activity

increased skin cancer

increased likelihood of cataracts

increased birth defects

13.

Which chemical that replaced CFCs in refrigerants is now a concern as a major greenhouse gas?

CFCs

HFCs

DDT

CFCl2

14.

Which is not an example of an ecological consequence of reduced stratospheric ozone?

loss of biodiversity from reduced photosynthesis in plants

collapse of marine food webs

reduced crop yield

reduced terrestrial biome productivity

15.

UV rays can cause obvious short term damage, such as sunburn, as well as long term damage that accumulates with each exposure to the sun.

True

False

16.

Which is most strongly absorbed by ozone in the statosphere?

UV-A

UV-B

UV-C

UV-B and UV-C

UV-A and UV-B

17.

Location of the large whole in the ozone.

Antarctica

Artic

Iceland

Africa

Reset

TOPIC 3

Total questions: 17

Worksheet time: 6mins

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