Science Exam Review - Practice Questions & Verified Answers
tmosphere? The atmosphere is a thin layer of gases surrounding the Earth.
Why is the atmosphere important? It contains oxygen, carbon dioxide, and water necessary for life, acts as insulation,
regulates temperatures, and protects from harmful rays.
How has photosynthesis changed the Earth's atmosphere? Photosynthesis removed CO2 and released oxygen, supporting the development of
other organisms.
What are the major gases in the atmosphere and their 21% oxygen, 78% nitrogen, and 1% other gases like water vapor, argon, carbon
percentages? dioxide, and ozone.
What solids or liquids can be found in the atmosphere? Ash from volcanic eruptions, water droplets, salt, hail, pollen, and dead skin cells.
What is unique about the Exosphere? It is the layer farthest from Earth's surface, separating the atmosphere from outer
space, and is about 6,200 miles thick.
What is a cool fact about the Thermosphere? The temperature can reach up to 4,500 degrees Fahrenheit, and it is home to the
International Space Station.
What is a unique characteristic of the Mesosphere? The air is thin, making it difficult to breathe, and most meteors burn up in this layer.
What does 'Meso' mean in relation to the atmosphere? Middle
What is the highest layer of the atmosphere where gases Stratosphere
are mixed?
What is the altitude range of the stratosphere? 12 to 30 miles
What is the characteristic of the stratosphere? It has its own set of layers with no storms or turbulence.
What protects us from ultraviolet radiation in the The ozone layer
atmosphere?
What is the altitude range of the troposphere? Surface to 12 miles
Where is 99% of all water vapor found in the atmosphere? In the troposphere
2026-2027 | Stuvia Edition
, Science Exam Review - Practice Questions & Verified Answers
What does 'Tropos' mean? Change
How does air pressure change with altitude? Air pressure decreases as altitude increases due to gravity's pull on air.
How does temperature change with altitude in the Temperature decreases as altitude increases.
troposphere?
How does temperature change with altitude in the Temperature increases as altitude increases due to ozone absorption of sunlight.
stratosphere?
What is air pollution? The contamination of air by harmful substances including gases and smoke.
What is smog? A hazy brown cloud of pollution formed when smoke mixes with fog.
What are some sources of air pollution? Industry, vehicles, and incinerators.
What health problems can smog cause? Irritation of airways, short-term health problems, and increased risk of heart and
lung diseases.
What are some examples of particulates that are Soot, smoke, pollen, and dust.
pollutants?
What health issues can long-term exposure to particulates Aggravated asthma, decreased lung function, airway irritation, coughing, and
cause? difficulty breathing.
What was the purpose of the Clean Air Act of 1970? To set limits on air pollution and ensure health and environmental protection.
What has been a trend in air quality since the Clean Air Improvements in air quality due to pollution limits.
Act?
How did Earth's atmosphere originally form? From gases and water vapor released by volcanoes.
What was the composition of Earth's original atmosphere? High in CO2 and lacking O2.
When did the first single-celled plants evolve? About 2 billion years ago.
2026-2027 | Stuvia Edition
tmosphere? The atmosphere is a thin layer of gases surrounding the Earth.
Why is the atmosphere important? It contains oxygen, carbon dioxide, and water necessary for life, acts as insulation,
regulates temperatures, and protects from harmful rays.
How has photosynthesis changed the Earth's atmosphere? Photosynthesis removed CO2 and released oxygen, supporting the development of
other organisms.
What are the major gases in the atmosphere and their 21% oxygen, 78% nitrogen, and 1% other gases like water vapor, argon, carbon
percentages? dioxide, and ozone.
What solids or liquids can be found in the atmosphere? Ash from volcanic eruptions, water droplets, salt, hail, pollen, and dead skin cells.
What is unique about the Exosphere? It is the layer farthest from Earth's surface, separating the atmosphere from outer
space, and is about 6,200 miles thick.
What is a cool fact about the Thermosphere? The temperature can reach up to 4,500 degrees Fahrenheit, and it is home to the
International Space Station.
What is a unique characteristic of the Mesosphere? The air is thin, making it difficult to breathe, and most meteors burn up in this layer.
What does 'Meso' mean in relation to the atmosphere? Middle
What is the highest layer of the atmosphere where gases Stratosphere
are mixed?
What is the altitude range of the stratosphere? 12 to 30 miles
What is the characteristic of the stratosphere? It has its own set of layers with no storms or turbulence.
What protects us from ultraviolet radiation in the The ozone layer
atmosphere?
What is the altitude range of the troposphere? Surface to 12 miles
Where is 99% of all water vapor found in the atmosphere? In the troposphere
2026-2027 | Stuvia Edition
, Science Exam Review - Practice Questions & Verified Answers
What does 'Tropos' mean? Change
How does air pressure change with altitude? Air pressure decreases as altitude increases due to gravity's pull on air.
How does temperature change with altitude in the Temperature decreases as altitude increases.
troposphere?
How does temperature change with altitude in the Temperature increases as altitude increases due to ozone absorption of sunlight.
stratosphere?
What is air pollution? The contamination of air by harmful substances including gases and smoke.
What is smog? A hazy brown cloud of pollution formed when smoke mixes with fog.
What are some sources of air pollution? Industry, vehicles, and incinerators.
What health problems can smog cause? Irritation of airways, short-term health problems, and increased risk of heart and
lung diseases.
What are some examples of particulates that are Soot, smoke, pollen, and dust.
pollutants?
What health issues can long-term exposure to particulates Aggravated asthma, decreased lung function, airway irritation, coughing, and
cause? difficulty breathing.
What was the purpose of the Clean Air Act of 1970? To set limits on air pollution and ensure health and environmental protection.
What has been a trend in air quality since the Clean Air Improvements in air quality due to pollution limits.
Act?
How did Earth's atmosphere originally form? From gases and water vapor released by volcanoes.
What was the composition of Earth's original atmosphere? High in CO2 and lacking O2.
When did the first single-celled plants evolve? About 2 billion years ago.
2026-2027 | Stuvia Edition
