C9

Question 1

What is the primary gas that makes up the Earth’s atmosphere?

Answer 1

Nitrogen

Question 2

True or False: Oxygen makes up approximately 21% of the Earth’s atmosphere.

Answer 2

True

Question 3

What gas is produced by the combustion of fossil fuels?

Answer 3

Carbon dioxide

Question 4

Fill in the blank: The greenhouse effect is caused by gases such as carbon dioxide and __________.

Answer 4

methane

Question 5

What is the main consequence of an increased greenhouse gas concentration in the atmosphere?

Answer 5

Global warming

Question 6

Which layer of the atmosphere contains the ozone layer?

Answer 6

Stratosphere

Question 7

What is the function of the ozone layer?

Answer 7

To absorb harmful ultraviolet (UV) radiation from the sun

Question 8

True or False: Human activities have no significant impact on atmospheric composition.

Answer 8

False

Question 9

What process do plants use to convert carbon dioxide into oxygen?

Answer 9

Photosynthesis

Question 10

Which gas is a byproduct of respiration in living organisms?

Answer 10

Carbon dioxide

Question 11

Multiple Choice: Which of the following is a major contributor to acid rain? A) Nitrogen B) Carbon dioxide C) Sulfur dioxide D) Oxygen

Answer 11

C) Sulfur dioxide

Question 12

What is the term for the gradual increase in the Earth’s average temperature due to human activities?

Answer 12

Climate change

Question 13

Fill in the blank: The Earth’s atmosphere is divided into several layers, including the troposphere, stratosphere, __________, and thermosphere.

Answer 13

mesosphere

Question 14

True or False: The troposphere is the highest layer of the atmosphere.

Answer 14

False

Question 15

What is the term for the trapping of heat by the atmosphere?

Answer 15

Greenhouse effect

Question 16

Which human activity is primarily responsible for the increase in carbon dioxide levels in the atmosphere?

Answer 16

Burning fossil fuels

Question 17

Short Answer: What is the role of carbon sinks in the carbon cycle?

Answer 17

They absorb and store carbon dioxide from the atmosphere.

Question 18

What is the main source of methane emissions?

Answer 18

Agriculture and livestock

Question 19

Multiple Choice: Which gas is not a greenhouse gas? A) Water vapor B) Nitrous oxide C) Helium D) Carbon dioxide

Answer 19

C) Helium

Question 20

What effect does deforestation have on atmospheric carbon dioxide levels?

Answer 20

It increases carbon dioxide levels.

Question 21

Fill in the blank: The process of converting nitrogen gas in the atmosphere into a usable form for plants is called __________.

Answer 21

nitrogen fixation

Question 22

True or False: The concentration of oxygen in the atmosphere has remained constant over geological time.

Answer 22

False

Question 23

What type of radiation does the ozone layer protect us from?

Answer 23

Ultraviolet (UV) radiation

Question 24

Short Answer: What is the significance of the carbon cycle?

Answer 24

It regulates Earth’s climate and supports life.

Question 25

What is the major consequence of acid rain on the environment?

Answer 25

It can harm ecosystems and damage buildings.

Question 26

Multiple Choice: Which of the following is a natural source of air pollution? A) Volcanoes B) Cars C) Factories D) Power plants

Answer 26

A) Volcanoes

Question 27

What is the primary role of photosynthesis in the atmosphere?

Answer 27

To convert carbon dioxide into oxygen and organic matter.