#1
Which gas makes up the majority of Earth's atmosphere?
Nitrogen
ExplanationDominant component of Earth's atmospheric composition.
#2
What is the layer of the atmosphere closest to the Earth's surface called?
Troposphere
ExplanationNearest layer to Earth's surface.
#3
Which layer of the atmosphere contains the ozone layer?
Stratosphere
ExplanationOzone layer resides in this atmospheric layer.
#4
Which gas is most responsible for the greenhouse effect?
Carbon dioxide
ExplanationKey contributor to the greenhouse effect.
#5
Which layer of the atmosphere is known for containing the ozone layer?
Stratosphere
ExplanationOzone layer is located within this layer.
#6
Which of the following is not a greenhouse gas?
Nitrogen
ExplanationNot involved in the greenhouse effect.
#7
Which of the following gases is considered a greenhouse gas?
Methane
ExplanationContributes to the greenhouse effect.
#8
What causes the phenomenon known as the aurora borealis or the northern lights?
Solar wind interacting with Earth's magnetic field
ExplanationInteraction between solar wind and Earth's magnetic field.
#9
What is the ozone layer primarily responsible for?
Absorbing ultraviolet (UV) radiation from the sun
ExplanationAbsorption of harmful UV radiation.
#10
What is the average composition of the Earth's atmosphere?
78% nitrogen, 21% oxygen, 1% other gases
ExplanationTypical makeup of Earth's air.
#11
Which layer of the atmosphere is characterized by a decrease in temperature with increasing altitude?
Troposphere
ExplanationTemperature decreases as altitude increases.
#12
What is the main reason why the sky appears blue?
Scattering of sunlight by air molecules
ExplanationSunlight scattering by atmospheric particles.
#13
Which of the following is not a primary layer of the Earth's atmosphere?
Ionosphere
ExplanationNot one of the main atmospheric layers.
#14
What is the primary source of oxygen in the Earth's atmosphere?
Photosynthesis
ExplanationGenerated by photosynthetic organisms.
#15
Which layer of the atmosphere is characterized by a high concentration of charged particles and is important for radio communication?
Thermosphere
ExplanationRich in charged particles; crucial for radio transmissions.
#16
What is the primary role of the ionosphere in the Earth's atmosphere?
Reflecting radio waves
ExplanationReflects radio signals back to Earth.
#17
Which phenomenon is responsible for the formation of the ozone hole?
Release of CFCs (chlorofluorocarbons)
ExplanationCaused by CFC emissions.
#18
What is the role of the mesosphere in protecting the Earth?
It burns up most meteoroids
ExplanationDestroys incoming meteoroids.