Lesson 3

Question 1

What percentage of carbon dioxide makes up all gases in the atmosphere?

Answer 1

Approximately 0.04%

This percentage is part of the total atmospheric composition.

Question 2

What role does carbon dioxide play for the Earth?

Answer 2

Regulates temperature and keeps it warm

Carbon dioxide is essential for maintaining the Earth’s temperature.

Question 3

What are the products of combustion?

Answer 3

Carbon dioxide and water vapor

Combustion of fossil fuels primarily produces these gases.

Question 4

How are fossil fuels formed?

Answer 4

From the remains of ancient plants and animals subjected to heat and pressure over millions of years

This process takes a long time and occurs underground.

Question 5

What is the chemical equation for photosynthesis?

Answer 5

6CO2 + 6H2O → C6H12O6 + 6O2

This equation represents how plants convert carbon dioxide and water into glucose and oxygen.

Question 6

What is the greenhouse effect?

Answer 6

A natural process where certain gases trap heat in the atmosphere

This effect is crucial for maintaining a habitable climate on Earth.

Question 7

What happens to most of the sun’s heat energy as it passes through the Earth’s atmosphere?

Answer 7

It is absorbed by the Earth’s surface

This energy warms the Earth, which then emits some of it back into space.

Question 8

Where else does some of this energy go?

Answer 8

It is emitted back into space

Not all energy is absorbed; a portion escapes the atmosphere.

Question 9

What does the word ‘emitted’ mean?

Answer 9

Released or sent out

Emission refers to the process of giving off energy or gases.

Question 10

Which gases in the Earth’s atmosphere can absorb heat energy?

Answer 10

Methane and carbon dioxide

These gases contribute significantly to the greenhouse effect.

Question 11

What does the absorption of heat energy result in?

Answer 11

Increased temperatures on Earth

This phenomenon contributes to global warming.

Question 12

Why is it called the greenhouse effect?

Answer 12

It mimics how greenhouses trap heat to maintain warmth

The analogy highlights the role of gases in retaining heat.

Question 13

What is the energy emitted from the sun otherwise known as?

Answer 13

Solar radiation

This energy is essential for life on Earth.

Question 14

What is global warming?

Answer 14

The increase in Earth’s average temperature due to rising greenhouse gas levels

This phenomenon is linked to human activities.

Question 15

Why was the Earth cooler 200 years ago?

Answer 15

Lower levels of greenhouse gases in the atmosphere

Industrial activities have significantly increased greenhouse gas emissions since then.

Question 16

What is climate change?

Answer 16

Long-term alteration of temperature and typical weather patterns in a place

Climate change encompasses global warming and its effects.

Question 17

State two potential effects of climate change.

Answer 17

• Increased severity of storms * Changes in precipitation patterns

These effects can lead to various environmental and societal challenges.

Question 18

Name the main greenhouse gas in the atmosphere.

Answer 18

Carbon dioxide (CO2)

It is the most significant greenhouse gas emitted by human activities.

Question 19

Name another greenhouse gas and state where it comes from.

Answer 19

Methane (CH4) - It comes from agriculture and livestock farming

Methane is significantly more effective at trapping heat than carbon dioxide.

Question 20

Which biological process removes carbon dioxide from the Earth’s atmosphere?

Answer 20

Photosynthesis

Plants use this process to convert carbon dioxide into oxygen and glucose.

Question 21

Which human activity has slowed down the rate at which carbon dioxide is removed from the atmosphere?

Answer 21

Deforestation

Removing trees reduces the number of plants available for photosynthesis.

Question 22

Describe the relationship between global warming and the greenhouse effect.

Answer 22

Global warming is a result of enhanced greenhouse effect due to increased greenhouse gases

Human activities like deforestation and burning fossil fuels exacerbate this effect.

Question 23

Describe how the change in global temperature has influenced weather patterns.

Answer 23

• Increased frequency of heat waves * More intense storms

These changes are linked to rising global temperatures and impact ecosystems and human life.