During a total solar eclipse around 151 years ago, what gas was found on the sun?
A. Hydrogen
B. Helium
C. Nitrogen
D. Fluorine
The sun is estimated to be around _________?
A. 4.4 billion years
B. 4.5 billion years
C. 4.6 billion years
D. 4.7 billion years
The moon is around ________ years old.
A. 4.51 billion years
B. 4.55 billion years
C. 4.53 billion years
D. 4.57 billion years
When is the relative humidity typically at its lowest throughout the day?
A. When the air temperature is highest
B. Just before sunrise
C. About midnight
D. When the air temperature is lowest
Water vapor is…?
A. A gas
B. A cloud droplet
C. A rain drop
D. A snowflake
Acid deposition causes…?
A. the greenhouse effect to lessen
B. lakes and forests to die
C. acid indigestion in humans
D. all the above are correct
When oil and gas resources are burned, how many forests and lakes are destroyed as a result?
A. deforestation
B. water pollution
C. acid rain
D. forest fire
When warm rain falls into a chilly layer of surface air what is the name of the type of fog that most frequently develops?
A. Radiation fog
B. Evaporation (mixing) fog
C. Advection fog
D. Upslope fog
Name of tiny organic or inorganic particles suspended in air is…?
A. particulate pollutant
B. gaseous pollutant
C. aerosol
D. none of these
Human body have… types of joints?
A. 4
B. 5
C. 6
D. 7