Chapter 13

Question 1

What is carbon footprint?

Answer 1

the total amount of carbon dioxide and other greenhouse gases emitted over the full life cycle of a product or event

Question 2

How could you reduce carbon footprint?

Answer 2

• eating organic food
• walking or using busses or cycle rather than driving
  etc. ….

Question 3

What are some greenhouse gases? What affect do they have on the greenhouse effect?

Answer 3

• carbon monoxide = toxic gas, colourless + odourless so hard to detect.
• sulphur dioxide = cause reparatory problems, combine with water vapour to make acid rain.
• nitrogen oxides = same as sulphur dioxide
• particulates = global dimming

Question 4

What percentage of - oxygen, argon, nitrogen and air(what does air contain?) is in the earths atmosphere?

Answer 4

• oxygen = 21%
• argon = 1%
• nitrogen = 78%
• air( carbon dioxide, variable amount of water vapour) = 0.04%

Question 5

What is thought that created the early atmosphere?

Answer 5

the intense volcanic eruptions which the early atmosphere was probably made from the gases produced by the volcanoes which was mainly carbon dioxide and little oxygen

Question 6

How were the oceans formed?

Answer 6

by the gases from the early atmosphere which were carbon dioxide, little oxygen and some water vapour, and as the earth cooled down most of the water vapour condensed to from the oceans

Question 7

Why did the proportion of carbon dioxide in the atmosphere go down?

Answer 7

• locked up in sedimentary rocks such as limestone, and in fossil fuels
• absorbed by plants for photosynthesis
• dissolved in the oceans

Question 8

When did algae first start producing oxygen, and what is a type of algae?

Answer 8

around 3.5 billion years ago to 2.7 billion years ago, some f the first algae was called = blue-green algae (or cyanobacteria)

Question 9

Why did the proportion of oxygen go up in the atmosphere?

Answer 9

because of photosynthesis by plants

Question 10

What 2 ways do humans contribute of the greenhouse effect?

Answer 10

• combustion of fossil fuels

- deforestation

Question 11

What are some side affects of global warming?

Answer 11

• some regions will not be able to produce food because of drought
• changes to distribution of species and migration patterns
• increase in sea levels because of melting polar ice caps
• reduction of water supplies in some regions