Science Yr08 Sum1

Question 1

1.1 Give the main gases that make up the Earth’s atmosphere

Answer 1

Nitrogen (78%), oxygen (21%), other including argon (0.9%)

Question 2

1.2 State the % of oxygen in today’s atmosphere

Answer 2

21%

Question 3

1.3 State the % of nitrogen in today’s atmosphere

Answer 3

78%

Question 4

1.4 How are fossil fuels formed?

Answer 4

Dead plankton, buried under mud, over millions of years can form crude oil

Question 5

1.5 Name three fossil fuels

Answer 5

Coal, oil, natural gas

Question 6

1.6 Name 3 greenhouse gases

Answer 6

Water, carbon dioxide and methane

Question 7

1.7 Describe 2 ways that humans are contributing to climate change

Answer 7

Burning fossil fuels and deforestation

Question 8

1.8 Define “finite” resource

Answer 8

A resource that will run out

Question 9

1.9 Define sustainable development

Answer 9

Using resources to meet the needs of people today without preventing people in the future from meeting theirs.

Question 10

1.1 Define catalyst

Answer 10

A substance which speeds up a reaction without being used up