Air and Water

Question 1

Gases in the atmosphere?

Answer 1

Nitrogen 80%
Oxygen 20%
Small amounts of CO2 and H2O

Question 2

Earth’s early atmosphere

Answer 2

Intense volcanic activity (mostly CO2 little O2), some NH3, CH4 and noble gases.
Water vapour condensed to form oceans, CO” and carbonates produced sediments.

Question 3

How did oxygen levels increase

Answer 3

Algae and plants produced O2 by phtotosynthessi

Question 4

Formula for photosynthesis

Answer 4

6CO2 + 6H2O -> C6H12O6 + 6O2

Question 5

How did CO2 levels decrease?

Answer 5

Plants by photosynthesis, formation of sedimentary rock that contained carbon

Question 6

Examples of greenhouse gases?

Answer 6

Water vapour, CO2, CH4

Question 7

What is the greenhouse effect?

Answer 7

Electromagnetic radiation from the sun pass through our atmosphere, Earth absorbes radiation and warms up, some heat is radiated as IR, Some IR radiation is absorbed by greenhouse gases in atmosphere, atmosphere warms up.

Question 8

Activities that increase greenhouse gases?

Answer 8

Driving, electrical consumption, livestock, decay or organic waste

Question 9

Effects of global climate changhe?

Answer 9

Species extinction, rising sea levels, migration, decreased crop yeild

Question 10

What is carbon footprint?

Answer 10

The total amount of CO2 and other greenhouse gases emitted over the full life cycle of a product, service or event.

Question 11

How can carbon footprint be reduced?

Answer 11

Using less electricity, reducing travel, planting more trees

Question 12

What are sources of atmospheric pollutants?

Answer 12

Combustion of fuels

Question 13

Effects of atmospheric pollutants?

Answer 13

Carbon monoxide - toxic gas which is colourless and odourless so difficult to detect
Sulfur dioxide - acid rain and respiratory problems in humans
Particulates - global dimming and health problems