Radiation is the energy released when atoms decay or split from unstable to stable forms. Radiation can damage cells through ionization, the process of altering atoms or molecules by removing electrons. There are three main sources of naturally occurring radiation: cosmic radiation which comes from outer space; terrestrial radiation from radioactive materials in the Earth's soil and rocks; and internal radiation resulting from ingesting or inhaling radioactive substances. Radon gas, a naturally occurring radioactive element found in rocks and soil, is one of the most pervasive radiation hazards along with ultraviolet radiation and other radioactive nuclides.

1. MCQ
1-.........is the energy released when atoms are split or decay naturally from less stable to more stable forms.
A)hazards
B)Technology
C)Radiation
D)Heat stroke
2-Radiation can damage thecells that make up living tissue by a process called ......
A)urbanization
B)Ionization
C)Vibration
D)Pollution
3-radiation can't posea health risk
A)true
B)False
4-naturally occurring radiation sources are
A)cosmic radiation
B)Internal radiation
C)Terrestrial radiation
D)All of the above
5-terrestrial radiation comes to theearth from outer space and sun
A)true
B)False
6-cosmic radiation comes from radioactive minerals that are within theearth-soil and rocks .
A)true
B)False
7-internal radiation occurs as a result of ingesting food or drugs,drinks from contaminated wells and inhaling air
A)true
B)False
8-the most pervasive hazards involve

2. A)radon contamination
B)Ultraviolet radiation
C)Radio nuclides
D)All of the above
9-............is a natural element found in most soil and rock, colorless,tasteless,odorless gas .
A)radon
B)Uranium
C)Radium
D)None is correct
Answers
1. C
2. B
3. B
4. D
5. B
6. B
7. A
8. D
9. A
Essay
1-discuss briefly
A)radiation ( definition , sources )
B)The most pervasive physicalhazards
C)Ozonedepletion and UV-related health effects
D)Noise pollution
E)Vibration
F)Psychological hazards and human health
G)Sociological hazards and human health
H)What is theresult of excessive population growth